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Herbaceous Perennials

Acanthus spinosus (Spiny Bear's Breeches)

Acanthus spinosus (Spiny Bear's Breeches)

A clump-forming, deciduous perennial with large, deeply-lobed, glossy, dark green leaves, spiny at the margins, and, from late spring to midsummer, erect racemes of white flowers with purple bracts.

Achillea 'Appleblossom' (Yarrow)

Achillea 'Appleblossom' (Yarrow)

A herbaceous perennial with grey-green, ferny foliage and tall stems topped with soft lilac-pink, flat topped flowers throughout summer. Height & Spread 75cm (2.5ft).

Achillea 'Moonshine' (Yarrow)

Achillea 'Moonshine' (Yarrow)

An upright perennial with feathery grey-green foliage and flat heads of small, light yellow flowers. Height 1m (3ft), Spread 50cm (1.5ft).

Achillea 'Summerwine' (Yarrow)

Achillea 'Summerwine' (Yarrow)

An upright, herbaceous perennial with linear, divided, dark green leaves and, in mid- and late summer, crimson, flat, flowerheads, fading to buff-pink. Height 1m (3ft), Spread 50cm (1.5ft).

Achillea 'Terracotta' (Yarrow)

Achillea 'Terracotta' (Yarrow)

A semi-evergreen perennial with rich burnt orange to golden yellow flat blooms above neat mounds of aromatic, greyish-green, ferny foliage. Height 1m (3ft), Spread 50cm (1.5ft).

Achillea millefolium 'Walther Funcke' (Yarrow)

Achillea millefolium 'Walther Funcke' (Yarrow)

A perennial with brilliant orange-red flower heads produced from early to late summer above neat mounds of greyish-green, ferny foliage. Height 1m (3ft), Spread 50cm (1.5ft).

Aconitum napellus subsp. vulgare 'Albidum'

Aconitum napellus subsp. vulgare 'Albidum'

An upright, tuberous, deciduous perennial with rounded, dark green leaves divided into five to seven, slender, toothed lobes and dense racemes of hooded, white flowers in summer. Height 1.5m (5ft), Spread 50cm (1.5ft).

Actaea japonica 'Cheju-Do' (Japanese Bugbane)

Actaea japonica 'Cheju-Do' (Japanese Bugbane)

A compact, clump-forming, rhizomatous, deciduous perennial with rounded, glossy, dark green leaves, flushed purple when young, and erect stems bearing slender racemes of small, white flowers in late summer & early autumn.

Actaea simplex 'Black Negligee' (Bugbane)

Actaea simplex 'Black Negligee' (Bugbane)

A tall, clump-forming, herbaceous perennial with pinnate, dark purple leaves & upright, wiry, dark purple stems bearing terminal racemes of small, creamy-white flowers in early autumn. Height 1.5m (5ft), Spread 60cm (2ft).

Actaea simplex 'Brunette' (Bugbane)

Actaea simplex 'Brunette' (Bugbane)

A clump-forming, herbaceous perennial with dark purple-bronze foliage and fragrant, pink-flushed white flowers on dark wiry stems in late summer to early autumn. Height 1.5m (5ft), Spread 50cm (1.5ft).

Agapanthus 'Blue Giant' (African Lily)

Agapanthus 'Blue Giant' (African Lily)

A clump-forming herbaceous perennial with broad, arching, strap-shaped, glossy, dark green leaves and sturdy, erect stems bearing large umbels of funnel-shaped blue flowers in mid and late summer.

Agapanthus 'Blue Jeans' (African Lily)

Agapanthus 'Blue Jeans' (African Lily)

A tender, clump-forming, evergreen perennial with glossy, dark green leaves and sturdy, erect stems bearing large, rounded heads of trumpet-shaped, navy blue flowers from midsummer into early autumn.

Agapanthus 'Bluestorm' (African Lily)

Agapanthus 'Bluestorm' (African Lily)

A clump-forming, evergreen perennial with strap-shaped, glossy, dark green leaves & erect stems bearing large, rounded heads of trumpet-shaped, violet-blue flowers from late spring into midsummer, sometimes into autumn.

Agapanthus 'Charlotte' (African Lily)

Agapanthus 'Charlotte' (African Lily)

A compact, clump-forming, half-hardy perennial with strap-shaped, mid-green leaves, &, in summer, tall stems bearing rounded umbels of star-shaped, blue flowers with a dark violet-blue stripe down the centre of each petal.

Agapanthus 'Dr. Brouwer' (African Lily)

Agapanthus 'Dr. Brouwer' (African Lily)

A semi-evergreen herbaceous perennial with dark green, strap-shaped leaves forming at its base. In late summer it bears large, spherical heads of tubular pale violet-blue and dark blue flowers on upright stems.

Agapanthus 'Ever White' (African Lily)

Agapanthus 'Ever White' (African Lily)

A semi-dwarf, compact herbaceous perennial with stap-shaped, green leaves producing multiple, upright stems with clusters of pure white flowers throughout the summer. Height & Spread 50cm (1.5ft).

Agapanthus 'Glenavon' (African Lily)

Agapanthus 'Glenavon' (African Lily)

A bulbous perennial with arching, strap-shaped, glossy, dark green leaves and sturdy, erect stems bearing huge flowerheads made up of hundreds of blue florets with dark stripes on each petal.

Agapanthus 'Golden Drop' (African Lily)

Agapanthus 'Golden Drop' (African Lily)

A deciduous, clump-forming perennial with slender green leaves banded with yellow. Clusters of lilac-blue flowers on tall stems in mid to late summer. Height & Spread 50cm (1.5ft).

Agapanthus 'Jacaranda' (African Lily)

Agapanthus 'Jacaranda' (African Lily)

A clump-forming, half-hardy, perennial with strap-shaped, dark green leaves, and, in early to midsummer, erect stems bearing umbels of trumpet-shaped, violet-blue flowers with a dark stripe in the centre of each petal.

Agapanthus 'Kilmurry White' (African Lily)

Agapanthus 'Kilmurry White' (African Lily)

A clump-forming, deciduous perennial with erect, strap-shaped, mid-green leaves and sturdy, upright stems bearing rounded umbels of white flowers in late summer and early autumn. Height & Spread 50cm (1.5ft).

Agapanthus 'Lola' (African Lily)

Agapanthus 'Lola' (African Lily)

A clump-forming, evergreen perennial with glossy, dark green leaves and erect stems bearing large, rounded heads of trumpet-shaped, deep blue flowers with a dark stripe down each petal from late spring into midsummer.

Agapanthus 'Northern Star' (African Lily)

Agapanthus 'Northern Star' (African Lily)

A clump-forming, deciduous perennial with strap-shaped, dark green leaves, and, in early to mid-summer erect stems bearing rounded umbels of violet-blue flowers with a dark purple stripe down the centre of each petal.

Agapanthus 'Royal Velvet' (African Lily)

Agapanthus 'Royal Velvet' (African Lily)

A clump-forming, borderline hardy, deciduous perennial with broad, strap-shaped, dark green leaves, and sturdy, erect stems bearing rounded, open umbels of trumpet-shaped, deep purple flowers in summer.

Agapanthus 'Streamline' (African Lily)

Agapanthus 'Streamline' (African Lily)

A small, semi-evergeen perennial with clumps of strap-like, mid-green leaves and open, mid-blue flowerheads borne on strong stems in summer to early autumn. Height & Spread 50cm (1.5ft).

Agapanthus 'Twister' (African Lily)

Agapanthus 'Twister' (African Lily)

A compact, clump-forming, half-hardy, deciduous perennial with broad, strap-shaped, dark green leaves, and, in summer, sturdy, erect stems bearing rounded umbels of trumpet-shaped, white flowers, purple-blue at the base.

Agapanthus Headbourne Hybrids (African Lily)

Agapanthus Headbourne Hybrids (African Lily)

A hardy, upright perennial with rounded heads of deep blue, pale blue or white trumpet-shaped flowers that rise above green strappy leaves in late summer. Height 1.2m (4ft), Spread 60cm (2ft).

Agapanthus inapertus 'Kilmurry Blue' (African Lily)

Agapanthus inapertus 'Kilmurry Blue' (African Lily)

A clump-forming, deciduous perennial with erect, strap-shaped, mid-green leaves and sturdy, upright stems bearing rounded umbels of violet-blue flowers with a purple stripe in late summer and early autumn.

Agapanthus inapertus subsp. pendulus 'Black Magic'

Agapanthus inapertus subsp. pendulus 'Black Magic'

A clump-forming, deciduous perennial with dark green leaves and, from summer into autumn, upright stems bearing rounded umbels of black buds opening to pendent, tubular, dark purple flowers in late summer and early autumn.

Agapanthus umbellatus 'Albus' (Lily Of The Nile)

Agapanthus umbellatus 'Albus' (Lily Of The Nile)

A clump-forming, herbaceous perennial with glossy, dark green, strap-shaped leaves and large umbels of very large, funnel-shaped white flowers in mid and late summer.

Agapanthus umbellatus 'Ovatus' (Lily Of The Nile)

Agapanthus umbellatus 'Ovatus' (Lily Of The Nile)

A clump-forming, evergreen perennial with broad, arching, strap-shaped, glossy, dark green leaves and sturdy, erect stems bearing large, rounded heads of bell-shaped, rich blue flowers in mid- to late summer.

Agastache 'Blackadder' (Giant Hyssop)

Agastache 'Blackadder' (Giant Hyssop)

An upright, clump-forming, herbaceous perennial with aromatic, dark grey-green leaves and whorled spikes dark purple buds opening to tubular, two-lipped, fragrant, violet flowers from summer to early autumn.

Agastache rugosa 'Little Adder' (Korean Mint)

Agastache rugosa 'Little Adder' (Korean Mint)

A compact, mound-forming, deciduous perennial with upright stems bearing aromatic, mid- to dark green leaves and erect spikes of tubular, lavender flowers from midsummer into autumn. Height & Spread 50cm (1.5ft).

Ajuga reptans 'Catlin's Giant' (Bugle)

Ajuga reptans 'Catlin's Giant' (Bugle)

A low-growing, spreading perennial which forms a mat of large, glossy purple-brown leaves and spikes of blue flowers. Height 30cm (1ft), Spread 1m (3ft).

Alchemilla mollis (Lady's Mantle)

Alchemilla mollis (Lady's Mantle)

Ground-covering perennial. Tiny, bright greenish-yellow flowers in mid-summer that may be dried. Height & Spread 50cm (1.5ft). Plant in full or partial sun.

Allium 'Medusa's Hair'

Allium 'Medusa's Hair'

A bulbous perennial forming a low mound of grey-green, narrow foliage with leaves that twist slightly at the end. Rounded clusters of light purple flowers on upright stems in summer. Height & Spread 60cm (2ft).

Allium 'Millenium'

Allium 'Millenium'

An upright, clump-forming, bulbous perennial with glossy, slightly aromatic, narrowly strap-shaped, dark green leaves and sturdy, erect stems bearing dense, rounded umbels of purple-pink flowers in summer.

Alstroemeria 'Summer Break' (Peruvian Lily)

Alstroemeria 'Summer Break' (Peruvian Lily)

An upright, clump-forming, tuberous perennial with dark green leaves and, from early summer into autumn, clusters of funnel-shaped, white-marked bright pink flowers with brown-flecked, yellow-flushed inner petals.

Alstroemeria 'Summer Sky' (Peruvian Lily)

Alstroemeria 'Summer Sky' (Peruvian Lily)

An upright, clump-forming, tuberous perennial with narrowly lance-shaped, dark green leaves and, from early summer into autumn, clusters of funnel-shaped, white flowers with brown-flecked, yellow-marked upper petals.

Amsonia hubrichtii (Hubricht's Bluestar)

Amsonia hubrichtii (Hubricht's Bluestar)

An erect, clump-forming, deciduous perennial with needle-like, bright green leaves turning golden-yellow in autumn and terminal clusters of star-shaped, pale blue flowers in late spring and early summer.

Anemone 'Fantasy Jasmine' (Japanese Anemone)

Anemone 'Fantasy Jasmine' (Japanese Anemone)

A compact, upright, deciduous, woody-based perennial with rounded to oval leaves and slender, wiry stems bearing umbels of saucer-shaped, deep-pink flowers from late summer into autumn. Height & Spread 50cm (1.5ft).

Anemone 'Ruffled Swan' (Japanese Anemone)

Anemone 'Ruffled Swan' (Japanese Anemone)

An erect, woody-based perennial with oval, palmate, toothed, mid- to dark green leaves and, from early summer to early autumn, dark erect, branching stems bearing semi-double, white flowers, purple on the reverse.

Anemone hupehensis var. japonica 'Splendens'

Anemone hupehensis var. japonica 'Splendens'

An erect, suckering, deciduous perennial with rounded to oval, palmately-lobed, dark green leaves and umbels of single, saucer-shaped, rose-pink flowers in summer. Height 60cm (2ft), Spread 50cm (1.5ft).

Anemone x hybrida 'Honorine Jobert' (Japanese Anemone)

Anemone x hybrida 'Honorine Jobert' (Japanese Anemone)

One of the most beautiful plants for late summer and early autumn, this makes clumps of large, dark, divided, vine-line leaves and pure white flowers with contrasting yellow stamens. Height 1.5m (5ft), Spread 1m (3ft).

Anemone x hybrida 'Serenade' (Japanese Anemone)

Anemone x hybrida 'Serenade' (Japanese Anemone)

A tall, herbaceous perennial with dark-green leaves. In late summer and early autumn, on tall stems, it bears large, semi-double, dark-pink flowers with prominent yellow stamens. Height 1m (3ft), Spread 50cm (1.5ft).

Anthemis tinctoria 'E.C. Buxton' (Dyer's Chamomile)

Anthemis tinctoria 'E.C. Buxton' (Dyer's Chamomile)

A clump-forming, evergreen perennial with finely-cut, fern-like green leaves and masses of light yellow daisies on single, slim stems from mid-summer until the first frosts. Height & Spread 1m (3ft).

Aquilegia vulgaris var. stellata 'Black Barlow'

Aquilegia vulgaris var. stellata 'Black Barlow'

A clump-forming, herbaceous perennial with divided, mid-green basal leaves and dark purple to purple-black flowers on tall stems in late spring and early summer. Height 75cm (2.5ft), Spread 50cm (1.5ft).

Aquilegia vulgaris var. stellata 'Nora Barlow' (Columbine)

Aquilegia vulgaris var. stellata 'Nora Barlow' (Columbine)

An upright herbaceous perennial, with nodding, spurless, double flowers and divided, dark-green leaves. The flower heads are made of many narrow, variagated pale/dark-pink/pale-green petals.

Aquilegia vulgaris var. stellata 'Ruby Port' (Columbine)

Aquilegia vulgaris var. stellata 'Ruby Port' (Columbine)

A mound-forming, herbaceous perennial with finely-divided, light green leaves and upright stems bearing double, nodding, deep red to maroon flowers in late spring and early summer. Height 1m (3ft), Spread 50cm (1.5ft).

Artemisia ludoviciana 'Silver Queen' (Western Mugwort)

Artemisia ludoviciana 'Silver Queen' (Western Mugwort)

A clump-forming, herbaceous perennial with lance-shaped, downy, greyish-white leaves and, occasionally, plumes of small, insignificant brownish-yellow flowers in late summer to early autumn. Height & Spread 1m (3ft).

Aster cordifolium 'Little Carlow' (Michaelmas Daisy)

Aster cordifolium 'Little Carlow' (Michaelmas Daisy)

An upright, bushy, deciduous perennial with small, linear to narrowly lance-shaped, dark green leaves, in autumn, daisy-like, violet-blue flowers with yellow centres. Height 1m (3ft), Spread 50cm (1.5ft).

Aster lateriflorum 'Lady in Black' (Calico Aster)

Aster lateriflorum 'Lady in Black' (Calico Aster)

A clump-forming perennial with spreading branches bearing dark purple leaves. Dense sprays of white flowers with prominent, dark pink centres bloom on slender, hairy, purple-flushed stems from late summer into autumn.

Aster novi-belgii 'Peter Harrison' (Michelmas Daisy)

Aster novi-belgii 'Peter Harrison' (Michelmas Daisy)

A compact, bushy, deciduous perennial with slender, branched stems bearing lance-shaped, dark green leaves and panicles of single, pink flower heads from late summer into autumn. Height 50cm (1.5ft), Spread 60cm (2ft).

Aster novi-belgii 'Purple Dome' (Michelmas Daisy)

Aster novi-belgii 'Purple Dome' (Michelmas Daisy)

A domed or mound-forming, deciduous perennial with narrowly lance-shaped, mid-green leaves and, in autumn, clusters of semi-double, purple flowers with yellow centres. Height & Spread 60cm (2ft).

Aster novi-belgii 'Winston S. Churchill'

Aster novi-belgii 'Winston S. Churchill'

An upright, bushy, clump-forming, deciduous perennial with dark green leaves and, from late summer into autumn, panicles of semi-double, bright pink to reddish-pink flower heads with yellow centres.

Aster x frikartii 'Monch' (Frikart's Aster)

Aster x frikartii 'Monch' (Frikart's Aster)

An upright, bushy herbaceous perennial with ovate, rough, dark green leaves and loose clusters of yellow-centred, lavender-blue flowers from late summer to early autumn. Height 1m (3ft), Spread 50cm (1.5ft).

Astilbe x arendsii 'Erika'

Astilbe x arendsii 'Erika'

A tall, spreading perennial with finely divided, dark green leaves that open burgundy-red in spring and panicles of pink flowers in summer. Height 1m (3ft), Spread 60cm (2ft).

Astilbe x arendsii 'Fanal'

Astilbe x arendsii 'Fanal'

A perennial with with deeply-divided, deep green leaves and feathery dark-pink, crimson flowers. Height & Spread 50cm (1.5ft).

Astilbe x arendsii 'White Gloria'

Astilbe x arendsii 'White Gloria'

A tall, vigorous perennial with finely divided, mid-green leaves and large panicles of white flowers in late summer and early autumn. Height 1m (3ft), Spread 50cm (1.5ft).

Astrantia 'Roma' (Masterwort)

Astrantia 'Roma' (Masterwort)

A clump-forming, deciduous perennial with deeply-divided, mid-green leaves and, from early summer to early autumn, erect, wiry, branching stems bearing umbels of rose-pink flowers surrounded by green-flushed, pink bracts.

Astrantia major subsp. involucrata 'Shaggy' (Masterwort)

Astrantia major subsp. involucrata 'Shaggy' (Masterwort)

A herbaceous perennial, with divided leaves and branching stems bearing greenish-white flowers surrounded by narrow, green-tipped white or pinkish bracts. Height 1m (3ft), Spread 50cm (1.5ft).

Bergenia 'Bressingham White' (Elephant's Ears)

Bergenia 'Bressingham White' (Elephant's Ears)

A clump-forming, rhizomatous, evergreen perennial with broadly ovate to rounded, dark green leaves and erect racemes of white flowers in spring. Height 50cm (1.5ft), Spread 60cm (2ft).

Bergenia 'Rose Crystal' (Elephant's Ears)

Bergenia 'Rose Crystal' (Elephant's Ears)

A clump-forming, evergreen perennial bearing oval, leathery, mid-green leaves and upright stems bearing dense clusters of open bell-shaped, pink flowers in mid-spring. Height 30cm (1ft), Spread 60cm (2ft).

Brunnera macrophylla 'Jack Frost' (Siberian Bugloss)

Brunnera macrophylla 'Jack Frost' (Siberian Bugloss)

A clump-forming perennial, with broad, hairy, heart-shaped leaves which are silver with green veins and blue forget-me-not type flowers in spring. Height & Spread 50cm (1.5ft).

Brunnera macrophylla 'Mister Morse' (Siberian Buglass)

Brunnera macrophylla 'Mister Morse' (Siberian Buglass)

A clump-forming perennial with broad, hairy, heart-shaped leaves which are silver with green veins and tiny white flowers in spring. Height & Spread 50cm (1.5ft).

Brunnera macrophylla (Siberian Bugloss)

Brunnera macrophylla (Siberian Bugloss)

A clump-forming herbaceous perennial with large heart-shaped, long stalked-leaves and broad sprays of small, clear blue flowers. Height & Spread 50cm (1.5ft).

Bulbine frutescens (Stalked Bulbine)

Bulbine frutescens (Stalked Bulbine)

A clump-forming, semi-woody, succulent, evergreen perennial with long, thin, fleshy, blue-green leaves and upright racemes of yellow flowers in summer. Height & Spread 50cm (1.5ft).

Campanula carpatica 'White Clips' (Tussock Bellflower)

Campanula carpatica 'White Clips' (Tussock Bellflower)

A small, spreading, mound-forming, herbaceous perennial with fresh-green, heart-shaped leaves. From early summer to early autumn, it is covered with white, cup-shaped flowers. Height 30cm (1ft), Spread 50cm (1.5ft).

Campanula glomerata (Clustered Bellflower)

Campanula glomerata (Clustered Bellflower)

A fast-growing, clump-forming perennial with erect stems bearing dark green leaves, and dense racemes of deep violet-blue, bell-shaped flowers throughout the summer. Height 50cm (1.5ft), Spread 1m (3ft).

Campanula persicifolia 'Takion Blue'

Campanula persicifolia 'Takion Blue'

A compact, upright, clump-forming, herbaceous to semi-evergreen perennial with narow, oval, dark green leaves and terminal racemes of cup-shaped, outward-facing, lavender-blue flowers in late spring and early summer.

Campanula persicifolia 'Takion White'

Campanula persicifolia 'Takion White'

A compact, upright, clump-forming, herbaceous to semi-evergreen perennial with narrow, lance-shaped, dark green leaves and cup-shaped, outward-facing, white flowers in summer. Height & Spread 50cm (1.5ft).

Campanula persicifolia (Peach-Leaved Bellflower)

Campanula persicifolia (Peach-Leaved Bellflower)

An upright perennial with evergreen, narrow, bright green basal leaves and, in summer, short, terminal racemes of slightly pendent, cup-shaped flowers varying from white to lilac-blue. Height 1m (3ft), Spread 30cm (1ft).

Campanula poscharskyana (Trailing Bellflower)

Campanula poscharskyana (Trailing Bellflower)

A compact, mound-forming to spreading, deciduous perennial with rounded to ovate, toothed, mid-green leaves and panicles of star-shaped, violet-blue flowers from summer into autumn. Height 20cm (8in), Spread 1m (3ft).

Canna 'Cleopatra'

Canna 'Cleopatra'

An erect, rhizomatous perennial bearing large, banana-like, maroon-marked, dark grey-green leaves and sturdy stems bearing racemes of spotted, red and yellow flowers from midsummer into autumn.

Canna 'Kreta'

Canna 'Kreta'

An erect, rhizomatous perennial bearing large, pointed, banana-like, bright green leaves and sturdy stems bearing racemes of rose-red flowers from midsummer into autumn. Height 1.5m (5ft), Spread 90cm (3ft).

Canna 'Red Velvet'

Canna 'Red Velvet'

An erect, rhizomatous perennial with large, banana-like, maroon-flushed, olive green leaves and strong, erect stems bearing racemes of bright red to orange-red flowers from midsummer into early autumn.

Canna 'Rose'

Canna 'Rose'

A erect, rhizomatous perennial bearing large, pointed, banana-like, dark green leaves and sturdy stems bearing racemes of pink flowers from midsummer into autumn. Height 1.2m (4ft), Spread 2ft (60cm).

Canna 'Tenerife'

Canna 'Tenerife'

An erect, rhizomatous perennial bearing large, pointed, banana-like, bright green leaves and, from midsummer into autumn, sturdy stems bearing racemes of golden yellow flowers, speckled orange-red.

Canna 'Tropicanna'

Canna 'Tropicanna'

An upright, rhizomatous perennial with large, banana-like, dark green, yellow and red-striped leaves and strong, erect stems bearing racemes of yellow-orange flowers from midsummer into early autumn.

Canna x generalis 'Cannova Bronze Scarlet'

Canna x generalis 'Cannova Bronze Scarlet'

An erect, rhizomatous perennial bearing large, pointed, banana-like, dark bronze-green leaves and sturdy stems bearing racemes of scarlet flowers from midsummer into autumn. Height 75cm (2.5ft), Spread 60cm (2ft).

Canna x generalis 'Cannova Mango'

Canna x generalis 'Cannova Mango'

An erect, rhizomatous perennial bearing large, pointed, banana-like, dark green leaves and sturdy stems bearing racemes of salmon-pink flowers from midsummer into autumn. Height 1.2m (4ft), Spread 60cm (2ft).

Canna x generalis 'Cannova Red Shades'

Canna x generalis 'Cannova Red Shades'

An erect, rhizomatous perennial bearing large, pointed, banana-like, dark green leaves and sturdy stems bearing racemes of red flowers from midsummer into autumn. Height 1.2m (4ft), Spread 60cm (2ft).

Canna x generalis 'Cannova Rose'

Canna x generalis 'Cannova Rose'

An erect, rhizomatous perennial bearing large, pointed, banana-like, dark green leaves and sturdy stems bearing racemes of rose-pink flowers from midsummer into autumn. Height 1.2m (4ft), Spread 60cm (2ft).

Canna x generalis 'Cannova Yellow'

Canna x generalis 'Cannova Yellow'

An erect, rhizomatous perennial bearing large, pointed, banana-like, dark green leaves and, from midsummer into autumn, sturdy stems bearing racemes of yellow flowers, lightly spotted orange.

Canna x generalis 'Tropicana Gold'

Canna x generalis 'Tropicana Gold'

An upright perennial with large, ovate, green and gold striped leaves, and bright yellow/orange flowers in summer. Height 2m (6ft), Spread 50cm (1.5ft).

Centaurea montana 'Alba' (White Perennial Cornflower))

Centaurea montana 'Alba' (White Perennial Cornflower))

A rhizomatous, mat-forming perennial with ovate to lance-shaped, sometimes lobed and toothed, mid-green leaves and white flowerheads from late spring to midsummer. Height 50cm (1.5ft), Spread 75cm (2.5ft).

Centaurea montana (Perennial Cornflower)

Centaurea montana (Perennial Cornflower)

A low-growing herbaceous perennial forming a clump of green, lance-shaped leaves and, in summer, electric blue flowers with a red centre. Height 60cm (2ft), Spread 50cm (1.5ft).

Ceratostigma plumbaginoides (Leadwort)

Ceratostigma plumbaginoides (Leadwort)

A mat-forming, spreading, herbaceous perennial with oval leaves which turn red or purple in autumn and bright blue flowers in late summer. Height & Spread 50cm (1.5ft).

Ceratostigma willmottianum 'Forest Blue'

Ceratostigma willmottianum 'Forest Blue'

A bushy, spreading, deciduous shrub with lance-shaped, dark green leaves turning red in autumn and clusters of vivid cobalt-blue flowers from late summer to early autumn. Height 1m (3ft), Spread 1.5m (5ft).

Cirsium rivulare 'Atropurpureum' (Plume Thistle)

Cirsium rivulare 'Atropurpureum' (Plume Thistle)

A herbaceous perennial forming a clump of leafy stems with round, red-purple flower heads in summer. Height 1.5m (5ft), Spread 50cm (1.5ft).

Cirsium rivulare 'Trevor's Blue Wonder' (Plume Thistle)

Cirsium rivulare 'Trevor's Blue Wonder' (Plume Thistle)

An upright, clump-forming, herbaceous perennial with spiny, grey-green leaves, softly hairy beneath, and erect, purple-flushed stems bearing thistle-like, magenta flower heads in mid- to late summer.

Coreopsis grandiflora 'Early Sunrise' (Tickseed)

Coreopsis grandiflora 'Early Sunrise' (Tickseed)

A clump-forming, herbaceous perennial, often grown as an annual, with lance-shaped, bright to mid-green leaves and semi-double, deep yellow flowers with orange-yellow centres blooming from late spring to late summer.

Cosmos 'Chocamocha'

Cosmos 'Chocamocha'

A dwarf, clump forming, herbaceous perennial with fine, green foliage and deep-maroon, velvet flowers that smell of chocolate. Height & Spread 30cm (1ft).

Crocosmia x crocosmiiflora 'Honey Angels' (Montbretia)

Crocosmia x crocosmiiflora 'Honey Angels' (Montbretia)

An upright perennial with mid-green, strap-shaped leaves and sprays of yellow, funnel-shaped flowers from mid-summer to early autumn. Height 60cm (2ft), Spread 30cm (1ft).

Crocosmia x crocosmiiflora 'Jackanapes' (Montbretia)

Crocosmia x crocosmiiflora 'Jackanapes' (Montbretia)

A clump-forming, cormous perennial with upright, sword-shaped, mid- to dark green leaves and, from midsummer to early autumn, arching bearing racemes of yellow-orange flowers, deep orange-red on the reverse.

Cynara cardunculus (Globe Artichoke)

Cynara cardunculus (Globe Artichoke)

A perennial with silvery-grey, thistle-like foliage and tall flower stems which are topped by fat thistle-like buds which resemble small globe artichokes in summer. Height 2.5m (8ft), Spread 1.5m (5ft).

Cynara scolymus 'Green Globe' (Artichoke)

Cynara scolymus 'Green Globe' (Artichoke)

A deciduous, thistle-like plant with arching silver leaves producing an edible globe vegetable just before flowering. This variety produces large green heads. Height 1.5m (5ft), Spread 50cm (1.5ft).

Dahlia 'Arabian Night'

Dahlia 'Arabian Night'

An upright, bushy, clump-forming, tuberous perennial with pinnate, toothed dark green leaves from summer into autumn, strong, upright stems bearing double, dark red flowers with incurved petals.

Dahlia 'Bishop of Auckland'

Dahlia 'Bishop of Auckland'

A bushy, clump-forming, tuberous perennial with toothed, pinnate, purple- to black-flushed, dark green leaves and, from midsummer to early autumn, single, red flowers with orange-yellow centres.

Dahlia 'Bishop of Dover'

Dahlia 'Bishop of Dover'

An upright, bushy, tuberous perennial with toothed, pinnate, purple-flushed, dark green leaves and upright, dark purple stems bearing single, violet-flushed, white flowers from midsummer into autumn.

Dahlia 'Bishop of Llandaff'

Dahlia 'Bishop of Llandaff'

A deciduous perennial, with dark-red foliage and semi-double brilliant red flowers. Height 1m (3ft), Spread 50cm (1.5ft).

Dahlia 'Bishop of York'

Dahlia 'Bishop of York'

A bushy, clump-forming, tuberous perennial with toothed, pinnate, purple to black-flushed, dark green leaves and single to semi-double, orange-flushed, yellow flowers from midsummer to early autumn.

Dahlia 'Black Jack'

Dahlia 'Black Jack'

An upright, bushy, tuberous perennial with toothed, pinnate, bronze- to purple-flushed dark green leaves and sturdy, upright stems bearing double, maroon to dark red flowers from summer into autumn.

Dahlia 'Catherine Deneuve'

Dahlia 'Catherine Deneuve'

A bushy, clump-forming, tuberous perennial with toothed, pinnate, purple- to bronze-flushed, dark green leaves and, in summer and autumn, upright stems bearing single, orange flowers with orange-red centres.

Dahlia 'Chat Noir'

Dahlia 'Chat Noir'

A tuberous perennial with divided green foliage, and rich deep red flowers on tall stems from summer until late autumn. Height 1.2m (4ft), Spread 50cm (1.5ft).

Dahlia 'Crazy Love'

Dahlia 'Crazy Love'

An upright, bushy, clump-forming, tuberous perennial with dark green leaves and, from midsummer to early autumn, dark purple stems bearing double, white flowers with yellow-green centres and pale lilac-pink petal tips.

Dahlia 'David Howard'

Dahlia 'David Howard'

A miniature-flowered decorative Dahlia with bronze-tinged, dark green, divided foliage and in summer and autumn it bears double bronze-orange flowers. Height & Spread 60cm (2ft).

Dahlia 'Engelhardt's Matador'

Dahlia 'Engelhardt's Matador'

An upright, bushy, clump-forming, tuberous perennial with pinnate, toothed, dark green-bronze leaves and, in summer and autumn, strong stems bearing decorative, purplish-pink flowers. Height 1m (3ft), Spread 75cm (2.5ft).

Dahlia 'Fascination'

Dahlia 'Fascination'

A tuberous perennial with purple-flushed foliage. From mid-summer to early autumn, it bears semi-double, pink flowers on dark, upright stems. Height 75cm (2.5ft), Spread 50cm (1.5ft).

Dahlia 'Happy Single Juliet'

Dahlia 'Happy Single Juliet'

A compact, upright, bushy, clump-forming, tuberous perennial with purple- or bronze-flushed leaves and, in summer and autumn, upright stems bearing small, single, rich lilac-pink flowers with dark yellow centres.

Dahlia 'Happy Single Kiss'

Dahlia 'Happy Single Kiss'

A compact, upright, bushy, clump-forming, tuberous perennial with purple- or bronze-flushed, dark green leaves and strong, upright stems bearing small, single, salmon to apricot flowers from summer into autumn.

Dahlia 'Honka'

Dahlia 'Honka'

An upright, bushy, clump-forming, tuberous perennial with green leaves &, in summer & autumn, upright stems bearing single, lightly fragrant, star-like, yellow flowers with rolled petals & bright orange or yellow centres.

Dahlia 'Karma Choc'

Dahlia 'Karma Choc'

A bushy, clump-forming, tuberous perennial with toothed, pinnate, purple- to black-flushed, dark green leaves and, in summer and autumn, dark stems bearing double, dark red to maroon flowers.

Dahlia 'Mystic Dreamer'

Dahlia 'Mystic Dreamer'

A compact, upright, bushy, clump-forming, tuberous perennial with bronze-flushed, dark green leaves and, from summer into autumn, upright stems bearing single, striped, pale pink flowers.

Dahlia 'Mystic Illusion'

Dahlia 'Mystic Illusion'

An upright, bushy, clump-forming, tuberous perennial with toothed, pinnate, purple- to black-flushed, dark green leaves and strong, upright stems bearing single, yellow flowers from summer into autumn.

Dahlia 'Nuit d'Ete'

Dahlia 'Nuit d'Ete'

A bushy, clump-forming, tuberous perennial with toothed, pinnate, dark green leaves and, in summer and autumn, upright stems bearing double, dark maroon flowers with narrow, pointed petals.

Dahlia 'Purple Haze'

Dahlia 'Purple Haze'

A bushy, clump-forming, tuberous perennial with toothed, pinnate, dark green leaves and upright, red-flushed stems bearing double, reddish-purple to magenta flowers in summer and autumn. Height 1m (3ft), Spread 60cm (2ft).

Dahlia 'Thomas A. Edison'

Dahlia 'Thomas A. Edison'

An upright, bushy, clump-forming, tuberous perennial with toothed, pinnate, dark green leaves and, from summer into autumn, double, reddish-purple flowers with paler outer petals. Height 1m (3ft), Spread 50cm (1.5ft).

Dahlia 'Twyning's After Eight'

Dahlia 'Twyning's After Eight'

A compact, bushy, clump-forming, tuberous perennial with toothed, pinnate, deep-purple foliage and, from midsummer into autumn, small, single, white flowers flushed pink, with orange-yellow centres.

Delphinium 'Astolat'

Delphinium 'Astolat'

A clump-forming perennial with lobed, mid-green leaves and spikes of deep pink flowers in summer. Height 1.5m (5ft), Spread 75cm (2.5ft).

Delphinium 'Atlantis'

Delphinium 'Atlantis'

A clump-forming, deciduous, medium-sized perennial with deeply segmented leaves. In early summer it has violet blue flowers with white eyes. Height 75cm (2.5ft), Spread 50cm (1.5ft).

Delphinium 'Christel'

Delphinium 'Christel'

An upright, clump-forming, herbaceous perennial with dark green leaves and tall spikes of double, dark purple-blue flowers in summer. Height 1.5m (5ft), Spread 60cm (2ft).

Delphinium 'Cliveden Beauty'

Delphinium 'Cliveden Beauty'

An upright, clump-forming perennial with palmately lobed, dark green leaves and erect, branching racemes of bowl-shaped, spurred, pale blue flowers in summer. Height 1m (3ft), Spread 30cm (1ft).

Delphinium 'Delgenius Shelby'

Delphinium 'Delgenius Shelby'

A vigorous, upright, compact, clump-forming, deciduous perennial with deeply lobed, dark green leaves and erect racemes of semi-double, pale blue flowers in summer. Height 60cm (2ft), Spread 50cm (1.5ft).

Delphinium 'Galahad'

Delphinium 'Galahad'

A clump-forming perennial with lobed, mid-green leaves and tall spikes of pure white flowers with white centres in summer. Height 1.5m (5ft), Spread 75cm (2.5ft).

Delphinium 'Guardian Blue'

Delphinium 'Guardian Blue'

A low, clump-forming, herbaceous perennial with deeply lobed, mid-green leaves and erect spikes of blue flowers in summer. Height 1m (3ft), Spread 60cm (2ft).

Delphinium 'Guardian Lavender'

Delphinium 'Guardian Lavender'

A low, clump-forming, herbaceous perennial with deeply lobed, mid-green leaves and erect spikes of lavender flowers in summer. Height 1m (3ft), Spread 60cm (2ft).

Delphinium 'King Arthur'

Delphinium 'King Arthur'

A tall, clump-forming, deciduous perennial with dense flower spikes of semi-double, rich blue flowers with white 'bees' in summer. Height 1.5m (5ft), Spread 75cm (2.5ft).

Delphinium 'Magic Fountains Dark Blue/White Bee'

Delphinium 'Magic Fountains Dark Blue/White Bee'

A semi-dwarf, clump-forming perennial with lobed, mid-green leaves and tall spikes of deep purple flowers with white centres in summer. Height 1m (3ft), Spread 60cm (2ft).

Delphinium 'Piccolo'

Delphinium 'Piccolo'

An upright, clump-forming, vigorous, herbaceous perennial with palmately lobed, dark green leaves and erect, racemes of bright blue flowers in summer. Height 1m (3ft), Spread 50cm (1.5ft).

Delphinium 'Volkerfrieden'

Delphinium 'Volkerfrieden'

A tall herbaceous perennial with deeply segmented green leaves. It has two blooming periods producing compact spires of bright blue panicles in early and late summer. Height 1m (3ft), Spread 60cm (2ft).

Dianella caerulea 'Cassa Blue' (Blue Flax Lily)

Dianella caerulea 'Cassa Blue' (Blue Flax Lily)

A tender, tufted, rhizomatous, evergreen perennial with stiff, upright, blue-green leaves and, in summer, panicles of pendent, star-shaped, blue flowers followed by spherical, glossy, purple fruit.

Dianthus barbatus 'Barbarini Rose' (Dwarf Sweet William)

Dianthus barbatus 'Barbarini Rose' (Dwarf Sweet William)

A compact, bushy, upright, perennial with lance-shaped, mid-green leaves and dense clusters of fragrant, fringed, rose-pink flowers blooming from late spring to late summer. Height & Spread 30cm (1ft).

Dicentra formosa 'Luxuriant'

Dicentra formosa 'Luxuriant'

A spreading perennial with lobed, mid- to dark green leaves and racemes of heart-shaped, red flowers in mid-spring to summer. Height & Spread 30cm (1ft).

Dicentra spectabilis 'Alba' (White Bleeding Heart)

Dicentra spectabilis 'Alba' (White Bleeding Heart)

A clump-forming, herbaceous perennial with deeply-divided, light green leaves and arching racemes of nodding, heart-shaped, white flowers in late spring and early summer. Height & Spread 1m (3ft).

Dicentra spectabilis 'Valentine' (Bleeding Heart)

Dicentra spectabilis 'Valentine' (Bleeding Heart)

A clump-forming, herbaceous perennial with deeply-divided, often red-flushed, grey-green leaves and, in late spring and early summer, dark red stems bearing nodding, heart-shaped, red flowers with white tips.

Dicentra spectabilis (Bleeding Heart)

Dicentra spectabilis (Bleeding Heart)

A clump-forming perennial with divided, bright green leaves and arching stems bearing racemes of rose-pink and white flowers in late spring and early summer. Height 1.2m (4ft), Spread 50cm (1.5ft).

Digitalis 'Pink Panther' (Foxglove)

Digitalis 'Pink Panther' (Foxglove)

A compact, rosette-forming, hairy biennial or perennial with ovate to lance-shaped, toothed, dark green leaves and, in summer, tall, upright spikes of rose-pink flowers with spotted throats.

Digitalis parviflora 'Milk Chocolate' (Foxglove)

Digitalis parviflora 'Milk Chocolate' (Foxglove)

A biennial with glossy, dark green basal leaves and tall, upright spikes of red-brown flowers with purple veining in summer. Height 60cm (2ft), Spread 50cm (1.5ft).

Digitalis purpurea 'Camelot Cream' (Foxglove)

Digitalis purpurea 'Camelot Cream' (Foxglove)

A rosette-forming, hairy, biennial or perennial with toothed, dark green leaves and, in summer, tall, upright spikes of cream flowers with purple-speckled throats. This cultivar will bloom in the first and second year.

Digitalis purpurea 'Camelot Lavender' (Foxglove)

Digitalis purpurea 'Camelot Lavender' (Foxglove)

A rosette-forming, hairy biennial or deciduous to semi-evergreen perennial with toothed, dark green leaves and, from late spring into summer, upright spikes of lavender flowers with maroon-spotted throats.

Digitalis purpurea 'Camelot Rose' (Foxglove)

Digitalis purpurea 'Camelot Rose' (Foxglove)

A rosette-forming, hairy, biennial or perennial with toothed, dark green leaves and, in summer, tall, upright spikes of rose-pink flowers with speckled throats. This cultivar will bloom in the first and second year.

Digitalis x valinii 'Foxlight Rose Ivory' (Foxglove)

Digitalis x valinii 'Foxlight Rose Ivory' (Foxglove)

A rosette-forming, semi-evergreen perennial with erect stems bearing dark green leaves and, from late spring to late summer, upright spikes of rose-pink flowers with light orange, spotted throats.

Digitalis x valinii 'Foxlight Ruby Glow' (Foxglove)

Digitalis x valinii 'Foxlight Ruby Glow' (Foxglove)

A rosette-forming, semi-evergreen perennial with erect stems bearing dark green leaves and, from late spring to late summer, upright spikes of rich-pink flowers with pale orange, spotted throats.

Echinacea purpurea 'Avalanche' (Coneflower)

Echinacea purpurea 'Avalanche' (Coneflower)

A compact, upright, clump-forming, herbaceous perennial with rough-hairy, dark green leaves and, from midsummer to early autumn, flowers with white petals surrounding a yellow-green central cone.

Echinacea purpurea 'White Swan' (Coneflower)

Echinacea purpurea 'White Swan' (Coneflower)

An erect, herbaceous perennial with ovate, toothed, hairy basal leaves, ovate to lance-shaped, toothed stem leaves and solitary, white daisy-like flower-heads with yellow central disks.

Echinops ritro 'Veitch's Blue' (Small Globe Thistle)

Echinops ritro 'Veitch's Blue' (Small Globe Thistle)

A clump-forming perennial, with deeply lobed, dark green, thistle-like foliage, and globular, steel-blue flowerheads on silver-grey, branched, leafy stems. Height 75cm (2.5ft), Spread 50cm (1.5ft).

Echinops ritro (Small Globe Thistle)

Echinops ritro (Small Globe Thistle)

A robust perennial, with divided, prickly dark green leaves whiter underneath, and round, violet-blue flowerheads on silver-grey, branched, leafy stems. Height 1m (3ft), Spread 50cm (1.5ft).

Epimedium x warleyense 'Orange Queen' (Warley Epimedium)

Epimedium x warleyense 'Orange Queen' (Warley Epimedium)

A compact, clump-forming, evergreen perennial with heart-shaped, mid- to light green leaves, flushed bronze or red when young, and upright stems bearing open racemes of small, pale orange-red flowers in spring.

Erigeron glaucus 'Sea Breeze' (Beach Aster)

Erigeron glaucus 'Sea Breeze' (Beach Aster)

A mound-forming, evergreen perennial with thick, often waxy or hairy, oval to spoon-shaped, grey-green leaves and, throughout summer, semi-double, daisy-like, lilac-pink flowers with yellow centres.

Erigeron karvinskianus 'Stallone' (Mexican Fleabane)

Erigeron karvinskianus 'Stallone' (Mexican Fleabane)

A bushy, spreading, to mound-forming, herbaceous perennial with upright stems bearing dark grey-green leaves and, from early summer into autumn, daisy-like, white flowers turning rose-pink to lilac-pink with age.

Eryngium planum 'Jade Frost' (Sea Holly)

Eryngium planum 'Jade Frost' (Sea Holly)

A clump-forming, evergreen perennial with grey-green leaves that have wide, creamy-white margins, flushed pink when young, and, in summer, cone-like, purple to violet-blue flower-heads with conspicuous, spiny bracts.

Eryngium zabelii 'Big Blue' (Sea Holly)

Eryngium zabelii 'Big Blue' (Sea Holly)

An upright, clump-forming, deciduous perennial with spiky, silvery grey-green, leaves and, in summer, stiff, branched stems bearing cone-shaped, blue flowerheads surrounded by prominent, spiny, silvery-blue bracts.

Eupatorium maculatum 'Atropurpureum'

Eupatorium maculatum 'Atropurpureum'

A large, robust herbaceous perennial with purple stems, whorled, oval leaves and flat, terminal clusters of small, reddish-purple flowers borne on erect stems in summer. Height 2.5m (8ft), Spread 1m (3ft).

Euphorbia 'Redwing' (Spurge)

Euphorbia 'Redwing' (Spurge)

A herbaceous perennial with blue-green, linear leaves arranged in whorls, that take on red tints in late winter. In spring, clusters of acid-yellow-green flowers open from reddish buds on upright, leafy stems.

Euphorbia characias 'Silver Swan' (Spurge)

Euphorbia characias 'Silver Swan' (Spurge)

An upright, evergreen perennial bearing linear, pale grey-green leaves with creamy-white margins, from mid-spring to early summer, large, cylindrical clusters of tiny flowers surrounded by pale yellow-green bracts.

Euphorbia palustris (Marsh Spurge)

Euphorbia palustris (Marsh Spurge)

A clump-forming perennial with upright stems clothed with narrow mid-green leaves that may become orange-tinted in autumn. In late spring, it bears terminal clusters of greenish yellow flowers. Height & Spread 1m (3ft).

Euphorbia x martinii 'Ascot Rainbow' (Spurge)

Euphorbia x martinii 'Ascot Rainbow' (Spurge)

An evergreen perennial with whorls of grey-green lance-shaped leaves edged in yellow. In cooler months, the foliage becomes flushed with shades of red, pink & orange. Clusters of lime-green flowers in early spring.

Filipendula rubra 'Venusta' (Meadowsweet)

Filipendula rubra 'Venusta' (Meadowsweet)

An erect, spreading, clump-forming perennial with bright green leaves and, in early and midsummer, crowded, terminal clusters of fragrant, rose-pink flowers that fade to pink with age.

Gaura lindheimeri

Gaura lindheimeri

A perennial with slender, tall stems with small, dark-green leaves and starry white flowers flushed pink in late summer and early autumn. Height 1.5m (5ft), Spread 1m (3ft).

Geranium 'Brookside' (Cranesbill)

Geranium 'Brookside' (Cranesbill)

A vigorous, spreading, deciduous perennial with lobed leaves and long-stems bearing large, rounded, dark-veined, lavender-blue flowers. Height 60cm (2ft), Spread 1m (3ft).

Geranium 'Coombland White' (Cranesbill)

Geranium 'Coombland White' (Cranesbill)

A clump-forming semi-evergreen perennial with lobed, olived-green leaves and clear white upward facing flowers flushed pink and lightly veined in summer and autumn. Height 20cm (8in), Spread 30cm (1ft).

Geranium 'Dreamland' (Cranesbill)

Geranium 'Dreamland' (Cranesbill)

A compact, mound-forming, herbaceous perennial with rounded, deeply-lobed, dark green leaves and erect, branching stems bearing single, cup-shaped, veined, pale pink flowers from late spring to early autumn.

Geranium 'Orkney Cherry'

Geranium 'Orkney Cherry'

A compact, hardy perennial with bronze foliage and, from summer into early autumn, dark pink flowers. Height & Spread 30cm (1ft).

Geranium 'Patricia' (Cranesbill)

Geranium 'Patricia' (Cranesbill)

A clump-forming herbaceous perennial with large, red-tinted leaves in autumn and tall stems bearing magenta flowers with black centres in summer. Height 1m (3ft), Spread 50cm (1.5ft).

Geranium macrorrhizum 'Bevan's Variety' (Cranesbill)

Geranium macrorrhizum 'Bevan's Variety' (Cranesbill)

A rhizomatous, semi-evergreen perennial with lobed, toothed, aromatic, sticky, light green leaves and clusters of purple-pink flowers in early summer. Height & Spread 50cm (1.5ft).

Geranium macrorrhizum 'Ingwersen's Variety'

Geranium macrorrhizum 'Ingwersen's Variety'

A semi-evergreen perennial, with rounded, pale green aromatic leaves and soft lilac-pink flowers in summer. Height & Spread 50cm (1.5ft).

Geranium macrorrhizum 'Sandy's Smile'

Geranium macrorrhizum 'Sandy's Smile'

A clump-forming, semi-evergreen to evergreen perennial with rounded, lobed, bright green leaves and clusters of pink flowers in summer. Height 50cm (1.5ft), Spread 1m (3ft).

Geranium pratense 'Black 'n' White' (Meadow Cranesbill)

Geranium pratense 'Black 'n' White' (Meadow Cranesbill)

A vigorous, clump-forming, herbaceous perennial with deeply lobed, toothed, purple- to bronze-flushed, dark green leaves and upright stems bearing veined, white to pale violet flowers from late spring to midsummer.

Geranium pratense 'Mrs Kendall Clark' (Meadow Cranesbill)

Geranium pratense 'Mrs Kendall Clark' (Meadow Cranesbill)

A vigorous, mound-forming, herbaceous perennial forming a clump of serrated and lobed leaves and subtle pale-violet flowers flushed rose-pink. Height & Spread 1m (3ft).

Geranium sanguineum 'Max Frei' (Bloody Cranesbill)

Geranium sanguineum 'Max Frei' (Bloody Cranesbill)

A compact, mound-forming herbaceous perennial with rounded, deeply-lobed, dark greeen leaves and magenta flowers from late spring to late summer. Height & Spread 30cm (1ft).

Geranium sanguineum (Bloody Cranesbill)

Geranium sanguineum (Bloody Cranesbill)

A clump forming herbaceous perennial with divided, mid-green leaves and bright magenta flowers in summer and autumn. Height & Spread 50cm (1.5ft).

Geranium sylvaticum 'Mayflower' (Wood Cranesbill)

Geranium sylvaticum 'Mayflower' (Wood Cranesbill)

A herbaceous perennial with a compact habit. Its green leaves are deeply divided with lobed segments. In spring and summer it bears violet-blue flowers with white centres. Height 75cm (2.5ft), Spread 50cm (1.5ft).

Geum 'Alabama Slammer' (Avens)

Geum 'Alabama Slammer' (Avens)

A mound-forming, deciduous to semi-evergreen perennial with pinnate, hairy, mid- to dark green basal leaves and slender stems bearing semi-double, red-flushed, orange to yellow-orange flowers from late spring into summer.

Geum 'Fiery Tempest' (Avens)

Geum 'Fiery Tempest' (Avens)

A mound-forming, deciduous to semi-evergreen perennial with mid- to dark green leaves and slender, wiry stems bearing semi-double, saucer-shaped, scarlet flowers from late spring into summer. Height & Spread 50cm (1.5ft).

Geum 'Flames of Passion' (Avens)

Geum 'Flames of Passion' (Avens)

A clump-forming herbaceous perennial with lobed, hairy basal leaves. In late spring to early summer, it bears semi-double, red flowers on upright, dark, wiry stems. Height 50cm (1.5ft), Spread 30cm (1ft).

Geum 'Mai Tai' (Avens)

Geum 'Mai Tai' (Avens)

A clump-forming, herbaceous perennial with pinnate, hairy, mid-green basal leaves and slender, burgundy stems bearing semi-double, frilled, pink-flushed, apricot flowers from late spring into midsummer.

Geum 'Mrs J. Bradshaw' (Avens)

Geum 'Mrs J. Bradshaw' (Avens)

A clump-forming herbaceous perennial with hairy, dark-green, basal leaves and purple stems bearing semi-double, orange-red flowers in summer. Height 60cm (2ft), Spread 50cm (1.5ft).

Geum 'Pink Petticoats' (Avens)

Geum 'Pink Petticoats' (Avens)

A mound-forming, deciduous to semi-evergreen perennial with mid- to dark green basal leaves and slender, wiry stems bearing semi-double, saucer-shaped, ruffled, pink to coral-pink flowers from mid-spring to early autumn.

Geum 'Scarlet Tempest' (Avens)

Geum 'Scarlet Tempest' (Avens)

A mound-forming, evergreen to semi-evergreen perennial with pinnate, toothed, hairy, mid- to dark green basal leaves and slender stems bearing orange-flushed, red flowers from late spring into autumn.

Geum 'Tempo Yellow' (Avens)

Geum 'Tempo Yellow' (Avens)

A mound-forming, deciduous to semi-evergreen perennial with mid-green leaves and, from late spring into summer, slender, wiry stems bearing semi-double, saucer-shaped, yellow flowers with maroon calyces.

Geum 'Totally Tangerine' (Avens)

Geum 'Totally Tangerine' (Avens)

A vigorous, mound-forming, herbaceous perennial with pinnate, hairy, mid-green basal leaves and slender stems bearing semi-double, apricot to orange flowers from late spring into autumn. Height 1m (3ft), Spread 60cm (2ft).

Geum coccineum (Avens)

Geum coccineum (Avens)

A clump-forming, deciduous perennial with upright, softly hairy, dark green leaves and, from late spring to late summer, cymes of orange or red flowers with spreading petals and prominent, yellow stamens.

Geum rivale 'Leonard's Variety' (Water Avens)

Geum rivale 'Leonard's Variety' (Water Avens)

A compact, clump-forming, herbaceous perennial with pinnately lobed, mid-green leaves and reddish-brown stems bearing nodding, bell-shaped, orange-flushed, copper-pink flowers from late spring into summer.

Gypsophila cerastioides 'Pretty Maid' (Baby's Breath)

Gypsophila cerastioides 'Pretty Maid' (Baby's Breath)

A dwarf, semi-evergreen perennial. It is a creeping plant, forming tufts of grey-green, hairy leaves. From late spring to early summer, it produces small, pink-flushed, fragrant, white, trumpet shaped flowers.

Helenium 'Sahin's Early Flowerer' (Sneezeweed)

Helenium 'Sahin's Early Flowerer' (Sneezeweed)

A perennial with an erect habit. Its lance-shaped leaves are mid-green. In summer and autumn it bears orange daisies with dark centres. Height 1m (3ft), Spread 50cm (1.5ft).

Helenium autumnale 'Short and Sassy' (Sneezeweed)

Helenium autumnale 'Short and Sassy' (Sneezeweed)

A compact, clump-forming, herbaceous perennial with oblong to lance-shaped, dark green leaves and, from midsummer to early autumn, orange and bright yellow flowers with brown central cones.

Helianthus 'Lemon Queen' (Sunflower)

Helianthus 'Lemon Queen' (Sunflower)

A vigorous, erect, rhizomatous, deciduous perennial with ovate, veined, dark green leaves and, from late summer into autumn, pale yellow flowers with darker yellow central disc-florets. Height 2m (6ft), Spread 1.2m (4ft).

Hemerocallis 'Pink Damask' (Daylily)

Hemerocallis 'Pink Damask' (Daylily)

A perennial forming a clump of narrow leaves and slender stems which bear large, funnel-shaped, deep salmon-pink flowers with a yellow throat. Height & Spread 1m (3ft).

Hemerocallis 'Red Rum' (Daylily)

Hemerocallis 'Red Rum' (Daylily)

A clump-forming, semi-evergreen perennial with strap-shaped leaves and in summer, bears red, funnel-shaped flowers with yellow throats. Height & Spread 50cm (1.5ft).

Hemerocallis 'Stella De Oro' (Day Lily)

Hemerocallis 'Stella De Oro' (Day Lily)

A vigorous, herbaceous perennial with mid-green, strap-shaped leaves. It is free-flowering, producing golden-yellow, fragrant, funnel-shaped flowers, throughout summer. Height 30cm, Spread 50cm (1.5ft).

Hemerocallis fulva var. kwanso (Daylily)

Hemerocallis fulva var. kwanso (Daylily)

A semi-evergreen, clump-forming perennial with narrow, strap-like, dark green leaves and, in summer, double, orange, trumpet-shaped flowers with a burgundy blush. Height 1m (3ft), Spread 50cm (1.5ft).

Heuchera 'Apple Twist' (Coral Bells)

Heuchera 'Apple Twist' (Coral Bells)

A compact, mound-forming, semi-evergreen to evergreen perennial bearing mid-green leaves, red with a yellow edge when young, and upright stems bearing tiny, star-shaped, creamy-white flowers from late spring into summer.

Heuchera 'Black Pearl' (Alum Root)

Heuchera 'Black Pearl' (Alum Root)

A compact, mound-forming, semi-evergreen to evergreen perennial bearing ruffled, glossy, dark purple-black leaves and slender, upright stems bearing open panicles of white flowers from early summer into autumn.

Heuchera 'Cherry Truffles' (Alum Root)

Heuchera 'Cherry Truffles' (Alum Root)

A compact, mound-forming, semi-evergreen to evergreen perennial bearing rounded, shallowly lobed, rich red leaves and slender, upright stems bearing panicles of light pink flowers from late spring into summer.

Heuchera 'Fire Chief' (Alum Root)

Heuchera 'Fire Chief' (Alum Root)

A clump-forming, mounded, semi-evergreen to evergreen perennial with ruffled, dark red to purple-red leaves and dark red stems bearing small, pink-flushed, white flowers in late spring, and again from summer into autumn.

Heuchera 'Forever Purple' (Alum Root)

Heuchera 'Forever Purple' (Alum Root)

A compact, mound-forming, semi-evergreen perennial bearing rounded, lobed, ruffled, silvery, dark purple leaves and short, slender, upright stems bearing panicles of purple-pink flowers throughout summer.

Heuchera 'Indian Summer Cranberry' (Alum Root)

Heuchera 'Indian Summer Cranberry' (Alum Root)

A compact, mound-forming, semi-evergreen to evergreen perennial bearing rounded, ruffled, red to orange-red leaves and slender, upright stems bearing panicles of small, bell-shaped, white flowers in summer.

Heuchera 'Indian Summer Huckleberry' (Alum Root)

Heuchera 'Indian Summer Huckleberry' (Alum Root)

A compact, mound-forming, semi-evergreen to evergreen perennial bearing ruffled, silver-purple leaves with dark purple veins and slender, upright stems bearing panicles of small, bell-shaped, white flowers in summer.

Heuchera 'Lime Marmalade' (Alum Root)

Heuchera 'Lime Marmalade' (Alum Root)

A mound-forming, semi-evergreen to evergreen, herbaceous perennial with ruffled, lime- to yellow-green leaves and tall, slender stems bearing panicles of tiny, bell-shaped, pale brown flowers from late spring into summer.

Heuchera 'Marmalade' (Alum Root)

Heuchera 'Marmalade' (Alum Root)

A clump-forming, evergreen perennial with red stems bearing ruffled leaves that emerge copper-red or pink and turn bronze or golden-yellow with maturity. Small, bell-shaped, red-brown flowers on upright stems in summer.

Heuchera 'Midnight Rose' (Alum Root)

Heuchera 'Midnight Rose' (Alum Root)

A mound-forming, semi-evergreen perennial with dark burgundy foliage splattered pink. The pink lightens to cream as summer progresses. Height & Spread 50cm (1.5ft).

Heuchera 'Obsidian' (Alum Root)

Heuchera 'Obsidian' (Alum Root)

A clump-forming, semi-evergreen perennial with smooth, glossy, rounded, lobed, dark purple-black leaves and tall red stems bearing loose panicles of ivory flowers in summer. Height & Spread 50cm (1.5ft).

Heuchera 'Purple Petticoats' (Alum Root)

Heuchera 'Purple Petticoats' (Alum Root)

A vigorous, clump-forming, semi-evergreen to evergreen perennial bearing ruffled, dark purple-green leaves, purple beneath, & slender, dark purple stems bearing open panicles of cream flowers from late spring into summer.

Heuchera 'Silver Gumdrop' (Alum Root)

Heuchera 'Silver Gumdrop' (Alum Root)

A compact, mound-forming, semi-evergreen perennial bearing purple-flushed, silvery-grey leaves and slender, upright stems bearing panicles of small, bell-shaped, reddish-pink flowers from late spring into summer.

Heuchera 'Sugar Frosting' (Alum Root)

Heuchera 'Sugar Frosting' (Alum Root)

A compact, clump-forming, semi-evergeen perennial with rounded, lobed, dark purple to burgundy leaves with silver, metallic markings and cream flowers on slender, erect stems in late spring and throughout summer.

Heuchera 'Wild Rose' (Alum Root)

Heuchera 'Wild Rose' (Alum Root)

A compact, mound-forming, semi-evergreen to evergreen perennial bearing purple-pink leaves with dark veins and slender, upright stems bearing panicles of small, bell-shaped, rose-pink flowers in summer.

Heuchera micrantha 'Palace Purple' (Alum Root)

Heuchera micrantha 'Palace Purple' (Alum Root)

A mound-forming, semi-evergreen perennial with ivy-like, purple leaves with red undersides. Panicles of small, pinkish-white, bell-shaped flowers are borne on slender, dark-red stems in late spring to early summer.

Heucherella 'Alabama Sunrise' (Foamy Bells)

Heucherella 'Alabama Sunrise' (Foamy Bells)

A clump-forming, semi-evergreen perennial. It has rounded leaves with cut margins that emerge yellow-green in spring, darken to green in summer then take on orangey-pink tints in autumn.

Heucherella 'Catching Fire' (Foamy Bells)

Heucherella 'Catching Fire' (Foamy Bells)

A clump-forming, semi-evergreen perennial with rounded, vibrant lime-green leaves that have conspicuous red central markings. In late-spring to early-summer, it bears clusters of small, white flowers on upright stems.

Heucherella 'Eye Spy' (Foamy Bells)

Heucherella 'Eye Spy' (Foamy Bells)

A mound-forming, semi-evergreen to evergreen perennial bearing bright yellow-green leaves, marked maroon at the veins. Slender stems bear clusters of tiny, vibrant pink flowers from late spring into summer.

Heucherella 'Golden Zebra' (Foamy Bells)

Heucherella 'Golden Zebra' (Foamy Bells)

A clump-forming, semi-evergreen to evergreen perennial bearing mounds of maple-like, lobed, golden-yellow leaves with dark red centres. Slender stems bear open panicles of small, white flowers from late spring into summer.

Heucherella 'Hopscotch' (Foamy Bells)

Heucherella 'Hopscotch' (Foamy Bells)

A mound-forming, semi-evergreen to evergreen perennial bearing lobed leaves in shades of bronze-red turning deep green in summer. Slender stems bear panicles tiny, bell-shaped, cream flowers from late spring into summer.

Heucherella 'Pink Fizz' (Foamy Bells)

Heucherella 'Pink Fizz' (Foamy Bells)

A semi-evergreen, clump-forming perennial, which produces a compact mound of deeply divided, silvery-green foliage with deep wine-red veins & masses of tiny, pink flowers on upright stems from late spring until mid-summer.

Heucherella 'Sweet Tea' (Foamy Bells)

Heucherella 'Sweet Tea' (Foamy Bells)

A compact, clump-forming, semi-evergreen perennial bearing mounds of lobed, dark-veined, orange-red leaves that darken in summer & lighten in autumn. In late spring & early summer, small white flowers bloom on wiry stems.

Hosta 'Night Before Christmas'

Hosta 'Night Before Christmas'

A clump-forming, herbaceous perennial producing a mound of glossy, ovate to heart-shaped, slightly twisted, dark-green leaves with creamy-white centres. Funnel-shaped, pale lavender flowers bloom on tall stems in summer.

Hosta 'Patriot' (Plantain Lily)

Hosta 'Patriot' (Plantain Lily)

A perennial of a clump-forming habit with rounded, heart-shaped leaves edged in white and, in summer, it bears lavender flowers on erect leafy stems. Height & Spread 50cm (1.5ft).

Hosta 'Pizzazz' (Plantain Lily)

Hosta 'Pizzazz' (Plantain Lily)

A mound-forming, herbaceous perennial bearing blue-green leaves with irregular, pale yellow to creamy-white margins. Sturdy scapes bear racemes of bell-shaped, pale lavender flowers in summer.

Hosta fortunei var. aureomarginata (Plantain Lily)

Hosta fortunei var. aureomarginata (Plantain Lily)

A deciduous, clump-forming perennial with large, variegated, bright green, heart-shaped leaves that have broad, creamy-yellow edges and trumpet-shaped, mauve flowers in late summer. Height & Spread 1m (3ft).

Hosta sieboldiana var. elegans

Hosta sieboldiana var. elegans

A clump-forming perennial with large, rounded, heart-shaped, grey-blue leaves and spikes of lilac-tinged, trumpet-shaped, white flowers in late summer. Height & Spread 1m (3ft).

Iris 'Alcazar' (Tall Bearded Iris)

Iris 'Alcazar' (Tall Bearded Iris)

A hardy, large bulbous perennial with strong, green, upright foliage and fragrant, rich purple flowers with a golden beard and lavender upper petals. Height 1m (3ft), Spread 30cm (1ft).

Iris 'Black Dragon' (Tall Bearded Iris)

Iris 'Black Dragon' (Tall Bearded Iris)

A vigorous, clump-forming, perennial with upright, grey-green leaves and, in late spring and early summer, erect stems bearing large, ruffled flowers with dark purple standards and black-flushed, dark purple falls.

Iris 'Bold Print'

Iris 'Bold Print'

A clump-forming, rhizomatous perennial with narrow, sword-shaped, grey-green leaves and, in spring, upright stems bearing purple-edged, white flowers. Height & Spread 60cm (2ft).

Iris 'Jane Phillips'

Iris 'Jane Phillips'

A clump-forming, rhizomatous perennial with upright, strap-like, grey-green leaves and, in early summer, pale violet-blue flowers with paler, veined falls. Height 1m (3ft), Spread 50cm (1.5ft).

Iris 'Kent Pride'

Iris 'Kent Pride'

A rhizomatous perennial with grey-green leaves. Flowers open from dark purple buds to reveal chestnut-brown standards, while falls have cream-yellow petal centres, marked with brown streaking, surrounded by pink-brown.

Iris 'Mer du Sud' (Tall Bearded Iris)

Iris 'Mer du Sud' (Tall Bearded Iris)

A clump-forming, rhizomatous, herbaceous perennial with upright, strap-like, grey-green leaves and erect stems bearing large, ruffled, blue flowers from late spring into summer. Height 75cm (2.5ft), Spread 50cm (1.5ft).

Iris 'Red Orchid'

Iris 'Red Orchid'

A clump-forming, rhizomatous, semi-evergreen perennial with sword-shaped, grey-green leaves and, in late spring and early summer, sturdy, upright stems bearing large, maroon to reddish-purple flowers with yellow beards.

Iris ensata 'Crystal Halo' (Japanese Water Iris)

Iris ensata 'Crystal Halo' (Japanese Water Iris)

A rhizomatous perennial with narrow leaves and erect stems bearing very large, deep purple flowers with a white picotee edging and darker purple veining, the falls are overlapping. Height 1m (3ft), Spread 50cm (1.5ft).

Iris lazica (Lazistan Iris)

Iris lazica (Lazistan Iris)

A clump-forming, rhizomatous, evergreen perennial with arching, glossy, narrowly lance-shaped, bright green leaves and, in early spring, lavender-blue to deep purple flowers with white-marked, spotted falls.

Iris pseudacorus (Yellow Flag)

Iris pseudacorus (Yellow Flag)

An extremely vigorous, rhizomatous, deciduous perennial forming an extensive clump of erect, sword-shaped, grey-green leaves and, in summer bright yellow flowers with brown or purple- veined falls.

Iris sibirica 'Blue King' (Siberian Iris)

Iris sibirica 'Blue King' (Siberian Iris)

A clump-forming, herbaceous perennial with linear, strap-like, grey-green leaves and erect stems bearing deep purple-blue flowers with yellow markings in late spring and early summer. Height 1m (3ft), Spread 50cm (1.5ft).

Iris sibirica 'Ruffled Velvet' (Siberian Iris)

Iris sibirica 'Ruffled Velvet' (Siberian Iris)

A perennial, rhizomatous Iris that features upright, strap-like, semi-evergreen, dark green foliage. It has medium-sized, deep purple flowers on tall stalks in early summer. Height 75cm (2.5ft), Spread 60cm (2ft).

Iris sibirica 'Silver Edge' (Siberian Iris)

Iris sibirica 'Silver Edge' (Siberian Iris)

A perennial, rhizomatous Iris that features upright, strap-like, semi-evergreen, blue-green foliage. It has medium-sized, mid-blue flowers with silver, ruffled edges in early summer. Height 75cm (2.5ft), Spread 60cm (2ft).

Iris sibirica 'Snow Queen' (Siberian Iris)

Iris sibirica 'Snow Queen' (Siberian Iris)

An upright herbaceous perennial with narrow, strap-shaped, green leaves and white, beardless flowers with purple veins that bloom in late spring. Height & Spread 1m (3ft).

Iris sibirica 'Sparkling Rose' (Siberian Iris)

Iris sibirica 'Sparkling Rose' (Siberian Iris)

A rhizomatous, clump-forming, herbaceous perennial with upright, linear, strap-like, dark green leaves and, in mid- to late spring, erect stems bearing dark lilac-pink flowers with veined, yellow- and white-marked falls.

Kirengeshoma palmata (Yellow Wax Bells)

Kirengeshoma palmata (Yellow Wax Bells)

A clump-forming, deciduous perennial with arching, maroon stems bearing lobed, slightly hairy, light green leaves and nodding cymes of fleshy, broadly tubular, pale yellow flowers in late summer and early autumn.

Knautia macedonica 'Red Knight' (Macedonian Scabious)

Knautia macedonica 'Red Knight' (Macedonian Scabious)

An upright, clump-froming, herbaceous perennial with slender, branched stems, pinnately lobed basal leaves and, in summer, numerous, long-lasting red flowerheads in summer. Height 1m (3ft), Spread 30cm (1ft).

Kniphofia 'Little Maid' (Red Hot Poker)

Kniphofia 'Little Maid' (Red Hot Poker)

A clump-forming, herbaceous perennial with arching, grass-like, mid-green leaves and spike-like racemes of pale green buds opening to pale-yellow flowers fading to cream in summer and autumn.

Leucanthemum 'Freak!' (Shasta Daisy)

Leucanthemum 'Freak!' (Shasta Daisy)

A vigorous, compact, clump-forming, herbaceous perennial with lance-shaped, dark green leaves and, in summer, upright stems bearing large, double, white flowers with yellow centres. Height 30cm (1ft), Spread 50cm (1.5ft).

Leucanthemum x superbum 'Banana Cream' (Shasta Daisy)

Leucanthemum x superbum 'Banana Cream' (Shasta Daisy)

A upright, clump-forming perennial with narrow, lance-shaped, toothed, dark green leaves and strong stems bearing large, single, lemon-yellow flowers in summer that fade to a creamy white as they mature.

Leucanthemum x superbum 'Laspider' (Shasta Daisy)

Leucanthemum x superbum 'Laspider' (Shasta Daisy)

A compact, clump-forming, deciduous perennial with toothed, glossy, dark green leaves and, in summer and autumn, sturdy, upright stems bearing large, double, white flowers with notched petals and yellow centres.

Leucanthemum x superbum 'Silver Princess' (Shasta Daisy)

Leucanthemum x superbum 'Silver Princess' (Shasta Daisy)

A dwarf, herbaceous perennial with dark green, glossy leaves and in summer and autumn bears white, daisy-like flowers with a yellow centre. Height & Spread 50cm (1.5ft).

Leucanthemum x superbum 'Snow Lady' (Shasta Daisy)

Leucanthemum x superbum 'Snow Lady' (Shasta Daisy)

An upright, clump forming perennial that appears in spring with dark green, deeply toothed leaves and masses of beautiful large white daisy-like flowers all summer. Height & Spread 50cm (1.5ft).

Leucanthemum x superbum 'Victorian Secret' (Shasta Daisy)

Leucanthemum x superbum 'Victorian Secret' (Shasta Daisy)

A compact, clump-forming, herbaceous perennial with erect stems bearing lance-shaped, dark green leaves and, from early summer to early autumn, erect stems bearing single to semi-double, white flowers with yellow centres.

Liatris spicata 'Alba' (Button Snakewort)

Liatris spicata 'Alba' (Button Snakewort)

A clump-forming perennial with linear to lance-shaped, mid-green leaves and erect, dense spikes of white flowerheads from summer into early autumn. Height 1.5m (5ft), Spread 50cm (1.5ft).

Liatris spicata 'Kobold' (Button Snakewort)

Liatris spicata 'Kobold' (Button Snakewort)

A small, compact, upright, clump-forming perennial with narrow foliage and deep purple, fluffy, terminal flower spikes that appear throughout summer. Height 60cm (2ft), Spread 30cm (1ft).

Lilium 'Abbeville's Pride' (Asiatic Lily)

Lilium 'Abbeville's Pride' (Asiatic Lily)

A compact, erect, bulbous perennial with a sturdy stem bearing elliptic, glossy, dark green leaves and, in summer, upward-facing, bright orange flowers. Height 50cm (1.5ft), Spread 20cm (8in).

Lilium 'Butter Pixie' (Asiatic Lily)

Lilium 'Butter Pixie' (Asiatic Lily)

A compact, erect, bulbous perennial with a sturdy stem bearing whorled, elliptic, glossy, dark green leaves and, in summer, upward-facing, bright yellow flowers with lightly spotted, green throats.

Lilium 'Elgrado' (Asiatic Lily)

Lilium 'Elgrado' (Asiatic Lily)

A compact, erect, bulbous perennial with a sturdy stem bearing elliptic, glossy, dark green leaves and, in summer, upward-facing, dark red flowers. Height 60cm (2ft), Spread 30cm (1ft).

Lilium 'Fire King'

Lilium 'Fire King'

A clump-forming bulbous perennial with leafy upright stems. In summer, it bears deep orange, funnel-shaped flowers with recurved petals that have purple freckles. Height 1m (3ft), Spread 30cm (1ft).

Lilium 'Foxtrot' (Asiatic Lily)

Lilium 'Foxtrot' (Asiatic Lily)

A compact, erect, bulbous perennial with a sturdy stem bearing elliptic, glossy, dark green leaves and, in summer, masses of upward-facing, light pink flowers. Height 50cm (1.5ft), Spread 20cm (8in).

Lilium 'Inuvik' (Asiatic Lily)

Lilium 'Inuvik' (Asiatic Lily)

A compact, erect, bulbous perennial with a sturdy stem bearing elliptic, glossy, dark green leaves and, in summer, upward-facing, white flowers with lightly spotted, green throats. Height 50cm (1.5ft), Spread 30cm (1ft).

Lilium 'Pink Perfection' (Lily)

Lilium 'Pink Perfection' (Lily)

A bulbous perennial with dark green, linear leaves and in summer, bears fragrant, pink, trumpet-shaped flowers, flushed purple at the edges of the petals and flushed yellow towards their centres.

Lilium regale 'Royal Gold' (Regal Lily)

Lilium regale 'Royal Gold' (Regal Lily)

A bulbous perennial with narrow, glossy, green leaves and large, trumpet-shaped, golden-yellow flowers. Height 1m (3ft), Spread 50cm (1.5ft).

Lobelia cardinalis 'Queen Victoria' (Cardinal Flower)

Lobelia cardinalis 'Queen Victoria' (Cardinal Flower)

A herbaceous perennial with dark red, oblong leaves and spikes of bright scarlet, two-lipped flowers in late summer and autumn. Height 1m (3ft), Spread 60cm (2ft).

Lobelia x speciosa 'Hadspen Purple'

Lobelia x speciosa 'Hadspen Purple'

An upright, bushy, softly hairy perennial with upright stems bearing ovate to lance-shaped, purple-flushed, light green leaves and terminal racemes of two-lipped, bright purple flowers from summer into autumn.

Lobelia x speciosa 'Sparkling Ruby'

Lobelia x speciosa 'Sparkling Ruby'

A clump-forming, slightly hairy perennial with ovate to oblong, mid-green leaves and erect, leafy, terminal racemes of double lipped, ruby red to dark red flowers in summer and autumn. Height 1m (3ft), Spread 60cm (2ft).

Lobelia x speciosa 'Starship Scarlet'

Lobelia x speciosa 'Starship Scarlet'

A compact, upright, bushy perennial with upright stems bearing ovate to lance-shaped, bronze-green leaves and terminal racemes of two-lipped, bright scarlet red flowers from summer into autumn.

Lupinus 'Chandelier' (Lupin)

Lupinus 'Chandelier' (Lupin)

A clump-forming, herbaceous perennial with palmate, mid-green leaves and tall, upright, terminal racemes of yellow flowers in summer. Height 1m (3ft), Spread 50cm (1.5ft).

Lupinus 'Gallery Blue' (Lupin)

Lupinus 'Gallery Blue' (Lupin)

A compact, bushy, herbaceous perennial with attractive, mid-green, palmate leaves. In summer, it bears densly-packed, upright racemes of pea-like flowers in shades of blue. Height & Spread 50cm (1.5ft).

Lupinus 'Gallery Pink' (Lupin)

Lupinus 'Gallery Pink' (Lupin)

A dwarf, clump-froming, herbaceous perennial with mid-green, palmate leaves and tall, upright, terminal racemes of pink flowers from spring until summer. Height 60cm (2ft), Spread 30cm (1ft).

Lupinus 'Gallery Red' (Lupin)

Lupinus 'Gallery Red' (Lupin)

A dwarf, clump-forming, herbaceous perennial with palmate, mid-green leaves and tall, upright, terminal racemes of dark red flowers in summer. Height 60cm (2ft), Spread 30cm (1ft).

Lupinus 'Gallery White' (Lupin)

Lupinus 'Gallery White' (Lupin)

A dwarf, clump-forming, herbaceous perennial with palmate, mid-green leaves and tall, upright, terminal racemes of white flowers from spring until summer. Height 60cm (2ft), Spread 30cm (1ft).

Lupinus 'Gallery Yellow' (Lupin)

Lupinus 'Gallery Yellow' (Lupin)

A dwarf, clump-forming, herbaceous perennial with palmate, mid-green leaves and tall, upright, terminal racemes of pale yellow flowers from spring until summer. Height 60cm (2ft), Spread 30cm (1ft).

Lupinus 'Manhattan Lights' (Lupin)

Lupinus 'Manhattan Lights' (Lupin)

A clump-forming, herbaceous perennial with palmate, dark green leaves and erect, dense, terminal racemes of bicoloured, purple and yellow flowers in summer. Height 1m (3ft), Spread 75cm (2.5ft).

Lupinus 'Masterpiece' (Lupin)

Lupinus 'Masterpiece' (Lupin)

A clump-forming, herbaceous perennial with palmate, mid-green leaves and erect, terminal racemes of deep purple-red flowers with orange flecks in early summer. Height 75cm (2.5ft), Spread 50cm (1.5ft).

Lupinus 'Red Rum' (Lupin)

Lupinus 'Red Rum' (Lupin)

A robust, clump-forming, herbaceous perennial with palmate, mid-green leaves and erect, terminal racemes of white-flecked, red flowers from late spring into summer. Height 1m (3ft), Spread 50cm (1.5ft).

Lupinus 'The Chatelaine' (Lupin)

Lupinus 'The Chatelaine' (Lupin)

A clump-forming, herbaceous perennial with palmate, mid-green leaves and tall, upright, terminal racemes of pink and pearl white flowers from late spring until early summer. Height 1.2m (4ft), Spread 75cm (2.5ft).

Lupinus 'Towering Inferno' (Lupin)

Lupinus 'Towering Inferno' (Lupin)

A vigorous, upright, clump-forming, herbaceous perennial with palmate, mid- to bright green leaves and large, erect, terminal racemes of deep orange to orange-red flowers in summer. Height 1m (3ft), Spread 60cm (2ft).

Lychnis chalcedonica (Maltese Cross)

Lychnis chalcedonica (Maltese Cross)

A herbaceous perennial with bright green leaves on upright stems bearing masses of bright red flowers in summer. Height 1m (3ft), Spread 50cm (1.5ft).

Lythrum virgatum 'Dropmore Purple' (Purple Loosestrife)

Lythrum virgatum 'Dropmore Purple' (Purple Loosestrife)

A tall, clump-forming herbaceous perennial with mid-green, lance-shaped leaves and spires of purple-pink flowers in mid to late summer. Height 1.2m (4ft), Spread 50cm (1.5ft).

Meconopsis betonicifolia (Blue Poppy)

Meconopsis betonicifolia (Blue Poppy)

A deciduous perennial, with rosettes of hairy bluish-green leaves and bowl-shaped, blue, purple-blue or white flowers, borne singly on bristly stalks in summer. Height 1.5m (5ft), Spread 50cm (1.5ft).

Monarda didyma (Bergamot)

Monarda didyma (Bergamot)

A perennial with aromatic, long, green foliage and distinctive, curving tube-shaped red or pink flower-heads from mid to late summer. Height 1m (3ft), Spread 50cm (1.5ft).

Monarda fistulosa (Wild Bergamot)

Monarda fistulosa (Wild Bergamot)

A bushy, clump-forming, deciduous perennial with aromatic, ovate to lance-shaped, toothed, softly hairy, grey-green leaves and whorls of tubular, two-lipped, pale pink to lilac flowers from midsummer into autumn.

Nepeta 'Junior Walker' (Catmint)

Nepeta 'Junior Walker' (Catmint)

A herbaceous perennial forming a compact, spreading clump with aromatic, dark green leaves and loose, terminal spikes of whorled, two-lipped, tubular, pale lavender flowers from early summer to early autumn.

Nepeta racemosa 'Walker's Low' (Dwarf Catmint)

Nepeta racemosa 'Walker's Low' (Dwarf Catmint)

An erect perennial with aromatic foliage, producing spikes of blue, tubular flowers in summer. Height & Spread 50cm (1.5ft).

Nepeta x faassenii 'Purrsian Blue' (Garden Catmint)

Nepeta x faassenii 'Purrsian Blue' (Garden Catmint)

A compact, mound-forming, herbaceous perennial with small, hairy, aromatic, toothed, grey-green leaves and, from early summer to early autumn, numerous, erect spikes of blue flowers with dark purple calyces.

Paeonia 'Felix Crousse' (Peony)

Paeonia 'Felix Crousse' (Peony)

A clump-forming, rounded to upright perennial with erect stems bearing deep green leaves &, in late spring & early summer, large, fragrant, double, reddish-pink flowers with dark centres & ruffled, silver-margined petals.

Paeonia 'Shirley Temple' (Double Peony)

Paeonia 'Shirley Temple' (Double Peony)

An upright, bushy, herbaceous perennial with divided, dark green leaves and, in late spring and early summer, sturdy, erect stems bearing large, double, white flowers. Height 2.5m (8ft), Spread 1.5m (5ft).

Paeonia lactiflora 'Dancing Butterfly' (Peony)

Paeonia lactiflora 'Dancing Butterfly' (Peony)

An upright, bushy, herbaceous perennial with dark green leaves and, in early summer, sturdy, erect stems bearing large, fragrant, single, pink flowers with yellow stamens. Height & Spread 1m (3ft).

Paeonia lactiflora 'General MacMahon' (Peony)

Paeonia lactiflora 'General MacMahon' (Peony)

A clump-forming, herbaceous perennial bearing red-mottled stems, dark green leaves with lance-shaped leaflets and, in summer, fragrant, double, crimson flowers with curled inner petals. Height & Spread 1m (3ft).

Paeonia lactiflora 'Kansas' (Peony)

Paeonia lactiflora 'Kansas' (Peony)

A clump-forming, herbaceous perennial with divided, dark green leaves and, in late spring and early summer, sturdy, erect stems bearing large, fragrant, double, bright reddish-pink flowers.

Paeonia lactiflora 'Laura Dessert' (Peony)

Paeonia lactiflora 'Laura Dessert' (Peony)

An upright, clump-forming, herbaceous perennial with large, divided, pale to mid-green leaves & fragrant, double, pale pink-flushed, white flowers with yellow inner petals blooming in summer. Height & Spread 75cm (2.5ft).

Paeonia lactiflora 'Miss Mary' (Peony)

Paeonia lactiflora 'Miss Mary' (Peony)

An upright, bushy, herbaceous perennial with dark green leaves and, from late spring into summer, strong, erect stems bearing large, cup-shaped, richly fragrant, single, deep red flowers with yellow stamens.

Paeonia lactiflora 'Sarah Bernhardt' (Peony)

Paeonia lactiflora 'Sarah Bernhardt' (Peony)

A herbaceous perennial with large, fragrant, rose-pink double flowers with ruffled inner petals. Height 2.5m (8ft), Spread 1.5m (5ft).

Papaver orientale 'Patty's Plum' (Oriental Poppy)

Papaver orientale 'Patty's Plum' (Oriental Poppy)

A clump-forming, herbaceous perennial with finely divided, grey-green leaves and, from spring into summer, upright stems bearing papery, reddish-purple flowers with black blotches at the base of each petal.

Papaver orientale 'Royal Wedding' (Oriental Poppy)

Papaver orientale 'Royal Wedding' (Oriental Poppy)

An upright herbaceous perennial with divided, grey-green leaves and large, fluffy, papery, solitary, white flowers with purple-black blotches at the base of each petal. Height 1m (3ft), Spread 50cm (1.5ft).

Penstemon 'Blackbird'

Penstemon 'Blackbird'

An upright perennial with lush green foliage and tubular-shaped, deep-purple flowers with a white striped throat from early summer. Height 1m (3ft), Spread 50cm (1.5ft).

Penstemon 'Garnet'

Penstemon 'Garnet'

A bushy, vigorous perennial with smooth, narrow, dark green leaves and small, tubular, deep wine-red flowers borne in erect spikes, from early summer to late autumn. Height 1m (3ft), Spread 50cm (1.5ft).

Penstemon 'Pensham Amelia Jane'

Penstemon 'Pensham Amelia Jane'

A bushy, clump-forming, semi-evergreen perennial with linear to lance-shaped, mid-green leaves and, from summer into autumn, upright racemes of tubular, red flowers with white throats. Height 1m (3ft), Spread 60cm (2ft).

Penstemon 'Pensham Arctic Fox'

Penstemon 'Pensham Arctic Fox'

A compact, bushy, semi-evergreen perennial with linear to lance-shaped, mid-green leaves and upright racemes of small, tubular, white flowers from midsummer to mid-autumn. Height 50cm (1.5ft), Spread 60cm (2ft).

Penstemon 'Pensham Plum Jerkum'

Penstemon 'Pensham Plum Jerkum'

A bushy, semi-evergreen perennial with lance-shaped, green leaves and, from midsummer into autumn, upright racemes of small, tubular, dark purple flowers with white mottled throats. Height 75cm (2.5ft), Spread 60cm (2ft).

Penstemon 'Pensham Wedding Day'

Penstemon 'Pensham Wedding Day'

A bushy, clump-forming, semi-evergreen perennial with linear to lance-shaped, mid-green leaves and upright racemes of tubular, white flowers from midsummer to mid-autumn. Height 75cm (2.5ft), Spread 60cm (2ft).

Penstemon 'Sour Grapes'

Penstemon 'Sour Grapes'

An upright, bushy clump-forming, semi-evergreen perennial with glossy, dark green leaves and, from early summer into autumn, upright panicles of tubular to bell-shaped, purple-pink flowers with white-marked throats.

Persicaria amplexicaulis 'Rosea' (Red Bistort)

Persicaria amplexicaulis 'Rosea' (Red Bistort)

A robust, upright, clump-forming perennial with large, ovate to lance-shaped, pointed, prominently-veined, mid-green leaves and narrow, long-stalked spikes of pink flowers from midsummer to early autumn.

Persicaria bistorta 'Superba' (Knotweed)

Persicaria bistorta 'Superba' (Knotweed)

A mat-forming, semi-evergreen perennial with large, ovate foliage and spikes of large, white bottlebrush flowers from late-summer to early-autumn. Height 75cm (2.5ft), Spread 1m (3ft).

Phlomis russeliana (Turkish Sage)

Phlomis russeliana (Turkish Sage)

A perennial that forms large green leaves on long petioles and whorls of hooded, pale yellow flowers on tall, erect stems from late spring though to early autumn. Unlike many Phlomis, it will tolerate some shade.

Phlox paniculata 'Adessa White' (Perennial Phlox)

Phlox paniculata 'Adessa White' (Perennial Phlox)

An upright, clump-forming, herbaceous perennial with broadly lance-shaped, dark green leaves & large, dense panicles of fragrant, tubular, white flowers from midsummer to early autumn. Height 1m (3ft), Spread 50cm (1.5ft).

Phlox paniculata 'Franz Schubert'

Phlox paniculata 'Franz Schubert'

A herbaceous perennial with erect stems of lance-shaped leaves and large panicles of fragrant, lilac flowers from mid-summer. Height 1m (3ft), Spread 30cm (1ft).

Physalis alkekengi 'Halloween Queen' (Cape Gooseberry)

Physalis alkekengi 'Halloween Queen' (Cape Gooseberry)

A compact perennial with bright green foliage and clusters of small, white flowers in summer followed by small edible fruits contained in bright orange-red, paper-thin Chinese Lanterns. Height & Spread 50cm (1.5ft).

Physostegia virginiana 'Rosea' (Obedient Plant)

Physostegia virginiana 'Rosea' (Obedient Plant)

An upright, spreading, herbaceous perennial with lance-shaped, toothed, dark green leaves and dense, spike-like racemes of tubular, pink flowers from midsummer into early autumn. Height 1m (3ft), Spread 60cm (2ft).

Polemonium caeruleum 'Brise d'Anjou' (Jacob's Ladder)

Polemonium caeruleum 'Brise d'Anjou' (Jacob's Ladder)

A clump-forming perennial with upright stems bearing pinnate, creamy-edged foliage. From late spring until midsummer it has clusters of bell-shaped, violet-blue flowers. Height & Spread 60cm (2ft).

Pulmonaria 'Blue Ensign' (Lungwort)

Pulmonaria 'Blue Ensign' (Lungwort)

A perennial which forms a clump of ovate leaves, and clusters of bright blue flowers in early spring fading to purple with age. Height & Spread 30cm (1ft).

Pulmonaria 'Majeste' (Lungwort)

Pulmonaria 'Majeste' (Lungwort)

A clump-forming perennial with silver foliage, which bears clusters of dark pink, tubular flowers in spring. Height 30cm (1ft), Spread 60cm (2ft).

Pulmonaria 'Opal' (Lungwort)

Pulmonaria 'Opal' (Lungwort)

A clump forming, herbaceous perennial that has ovate, green leaves that are evenly spotted with white and has clusters of blue and white shimmering flowers throughout spring. Height 30cm (1ft), Spread 60cm (2ft).

Pulmonaria 'Raspberry Splash' (Lungwort)

Pulmonaria 'Raspberry Splash' (Lungwort)

A clump-forming, deciduous to semi-evergreen perennial with dark green leaves, heavily marked with silvery-white spots. Dense clusters of funnel-shaped, purple to reddish-pink flowers bloom on short stems in spring.

Pulmonaria 'Victorian Brooch' (Lungwort)

Pulmonaria 'Victorian Brooch' (Lungwort)

A clump-forming, semi-evergreen perennial with ovate, mid-green leaves, heavily marked with silvery white spots. Dense clusters of funnel-shaped, magenta to coral flowers bloom on short stems in spring.

Pulmonaria angustifolia 'Azurea' (Lungwort)

Pulmonaria angustifolia 'Azurea' (Lungwort)

A deciduous perennial forming a clump of lance-shaped, unspotted green leaves, with pink buds opening to bright blue flowers in spring. Height 30cm (1ft), Spread 50cm (1.5ft).

Rodgersia pinnata (Featherleaf Rodgersia)

Rodgersia pinnata (Featherleaf Rodgersia)

A clump-forming perennial with large, wrinkled, veined, glossy, dark green leaves and red-flushed stems bearing dense panicles of small, star-shaped, creamy-white, red or pink flowers in mid-and late summer.

Rudbeckia fulgida var. sullivantii 'Goldsturm'

Rudbeckia fulgida var. sullivantii 'Goldsturm'

A clump-forming, herbaceous perennial with rough, dark-green, ovate leaves and large black-eyed, single, yellow daisy flowers over a long-flowering season. Height 1m (3ft), Spread 60cm (2ft).

Rudbeckia fulgida var. sullivantii 'Little Goldstar'

Rudbeckia fulgida var. sullivantii 'Little Goldstar'

A compact, clump-forming, herbaceous perennial with dark green pinnate leaves &, from midsummer into autumn, upright stems bearing double, golden-yellow flowers with dark brown central cones. Height & Spread 50cm (1.5ft).

Rudbeckia hirta 'Sunbeckia Juliana' (Black-Eyed Susan)

Rudbeckia hirta 'Sunbeckia Juliana' (Black-Eyed Susan)

An erect, clump-forming, half-hardy biennial or short-lived perennial with ovate, toothed, dark green leaves and golden-yellow flowers from summer into autumn. Height & Spread 50cm (1.5ft).

Rudbeckia hirta 'Sunbeckia Ophelia' (Black-Eyed Susan)

Rudbeckia hirta 'Sunbeckia Ophelia' (Black-Eyed Susan)

An erect, clump-forming, half-hardy biennial or short-lived perennial with ovate, toothed, dark green leaves and golden-yellow flowers from summer into autumn. Height & Spread 50cm (1.5ft).

Rudbeckia hirta 'Sunbeckia Sophia' (Black-Eyed Susan)

Rudbeckia hirta 'Sunbeckia Sophia' (Black-Eyed Susan)

An erect, clump-forming, half-hardy biennial or short-lived perennial with ovate, toothed, dark green leaves and, from summer into autumn, golden-yellow flowers, yellow-orange at the base of the petals.

Rudbeckia nitida 'Herbstsonne' (Coneflower)

Rudbeckia nitida 'Herbstsonne' (Coneflower)

A tall herbaceous perennial, bearing single, gold-yellow ray floret flowers with a dark-yellow center. Height 2m (6ft), Spread 1m (3ft).

Salvia 'Cherry Lips' (Sage)

Salvia 'Cherry Lips' (Sage)

A bushy, evergreen sub-shrub with small, ovate, aromatic, mid-green leaves, often turning dark-red in autumn, and loose racemes of two-lipped, reddish-pink and white flowers in summer and autumn.

Salvia 'Flamingo'

Salvia 'Flamingo'

An aromatic perennial of a bushy habit with rosettes of broad green leaves and erect stems. Long lasting, large bright pink flowers in coral calyces throughout the summer into autumn. Height & Spread 1m (3ft).

Salvia 'Kisses and Wishes' (Sage)

Salvia 'Kisses and Wishes' (Sage)

A tender, upright, bushy, woody-based perennial, often grown as an annual, with oblong to ovate, toothed, aromatic, dark green leaves and dark stems bearing open racemes of tubular, pink flowers from midsummer into autumn.

Salvia 'May Night' (Wood Sage)

Salvia 'May Night' (Wood Sage)

An upright perennial with dark-green foliage and racemes of deep violet flowers in early summer. Height 1m (3ft), Spread 50cm (1.5ft).

Salvia guaranitica 'Black and Blue' (Anise-Scented Sage)

Salvia guaranitica 'Black and Blue' (Anise-Scented Sage)

A clump-forming, aromatic, semi-woody perennial, often grown as an annual, with ovate, toothed, wrinkled, hairy, dark-green leaves and, from late summer into autumn, loose spikes of dark blue flowers with black calyces.

Salvia nemorosa 'Blue Marvel' (Balkan Clary)

Salvia nemorosa 'Blue Marvel' (Balkan Clary)

A compact, upright, clump-forming, herbaceous perennial with ovate, toothed, aromatic, dark grey-green leaves and, in summer, dense, erect racemes of blue flowers with maroon calyces. Height & Spread 30cm (1ft).

Salvia nemorosa 'Caradonna Pink Inspiration'

Salvia nemorosa 'Caradonna Pink Inspiration'

An upright, clump-forming, deciduous perennial with aromatic, wrinkled, dark grey-green leaves and maroon stems bearing slender, erect racemes of whorled, tubular, two-lipped, pink to lilac-pink flowers in summer.

Salvia nemorosa 'Caradonna' (Balkan Clary)

Salvia nemorosa 'Caradonna' (Balkan Clary)

A compact, clump-forming perennial with dark-green, toothed leaves. From summer through to early autumn, it bears spikes of violet-blue flowers on dark, upright stems. Height 75cm (2.5ft), Spread 50cm (1.5ft).

Salvia nemorosa 'East Friesland' (Balkan Clary)

Salvia nemorosa 'East Friesland' (Balkan Clary)

An upright, compact perennial with ovate leaves and deep violet-blue flowers with pink bracts in summer and autumn. Height & Spread 50cm (1.5ft).

Salvia nemorosa 'Lubecca' (Balkan Clary)

Salvia nemorosa 'Lubecca' (Balkan Clary)

A bushy, upright, deciduous perennial with aromatic, grey-green foliage and spikes of intense purple flowers in summer and autumn. Height & Spread 50cm (1.5ft).

Salvia nemorosa 'Pink Beauty' (Balkan Clary)

Salvia nemorosa 'Pink Beauty' (Balkan Clary)

A clump-forming, herbaceous perennial with ovate to lance-shaped, toothed, aromatic, grey-green leaves and, from midsummer to early autumn, dense, erect racemes of rose-pink flowers with reddish-purple calyces.

Salvia nemorosa 'Sensation White' (Balkan Clary)

Salvia nemorosa 'Sensation White' (Balkan Clary)

A compact, upright, clump-forming, herbaceous perennial with ovate, toothed, aromatic, wrinkled, mid-green leaves and dense, erect racemes of white flowers in summer. Height & Spread 50cm (1.5ft).

Salvia nemorosa 'Viola Klose' (Wood Sage)

Salvia nemorosa 'Viola Klose' (Wood Sage)

A compact, clump-forming, herbaceous perennial with slightly hairy, lance-shaped, mid-green leaves and erect racemes of deep violet, hooded flowers from early summer to early autumn. Height 50cm (1.5ft), Spread 30cm (1ft).

Salvia verticillata 'Purple Rain'

Salvia verticillata 'Purple Rain'

A herbaceous perennial with an upright form. It has ovate, slightly hairy, mid-green basal leaves and is topped with spikes of purple flowers in summer. Height 1m (3ft), Spread 50cm (1.5ft).

Salvia x jamensis 'Hot Lips' (Sage)

Salvia x jamensis 'Hot Lips' (Sage)

An evergreen sub-shrub with small, aromatic, ovate foliage which may turn dark-red in autumn and open racemes of crimson and white flowers on spikes in summer and autumn. Height & Spread 1m (3ft).

Salvia x jamensis 'Nachtvlinder' (Sage)

Salvia x jamensis 'Nachtvlinder' (Sage)

An upright, bushy, half-hardy, evergreen sub-shrub with small, ovate to elliptic, aromatic, mid-green leaves and open racemes of velvety, hooded, deep reddish-purple flowers from summer into autumn.

Salvia x jamensis 'Pink Lips' (Sage)

Salvia x jamensis 'Pink Lips' (Sage)

An upright, bushy, borderline hardy, semi-evergreen sub-shrub with small, ovate to elliptic, aromatic, dark green leaves and open racemes of two-lipped, pink and white flowers from summer into autumn.

Salvia x sylvestris 'Mainacht' (Wood Sage)

Salvia x sylvestris 'Mainacht' (Wood Sage)

An upright perennial with dark-green foliage and racemes of deep violet flowers in early summer. Height 1m (3ft), Spread 50cm (1.5ft).

Scabiosa columbaria (Small Scabious)

Scabiosa columbaria (Small Scabious)

An upright perennial with lobed leaves, and pale purple-blue flowers in summer and early autumn. Height 1m (3ft), Spread 50cm (1.5ft).

Schizostylis coccinea (Kaffir Lily)

Schizostylis coccinea (Kaffir Lily)

A vigorous, clump-forming perennial with narrow, bright green leaves and spikes of open, cup-shaped, scarlet flowers in autumn. Height 60cm (2ft), Spread 30cm (1ft).

Sedum 'Mr Goodbud' (Stonecrop)

Sedum 'Mr Goodbud' (Stonecrop)

An upright, clump-forming, herbaceous perennial with purple stems bearing fleshy, light to blue-green leaves & sturdy stems bearing terminal clusters of tiny, star-shaped, purple-pink flowers from late summer into autumn.

Sedum spectabile 'Autumn Joy' (Stonecrop)

Sedum spectabile 'Autumn Joy' (Stonecrop)

One of the finest of all upright Sedums. The umbrella-like flower heads are pink and change to a rosy red in autumn and contrasting with its green foliage. Height & Spread 50cm (1.5ft).

Sedum spectabile 'Brilliant' (Ice Plant)

Sedum spectabile 'Brilliant' (Ice Plant)

A perennial forming a clump with thick stems and broad elliptic, grey-green leaves and flat cymes of dark-centred, bright pink flowers. Height & Spread 50cm (1.5ft).

Sedum spectabile 'Stardust' (Ice Plant)

Sedum spectabile 'Stardust' (Ice Plant)

A clump-forming, deciduous perennial with thick, upright, unbranched stems bearing broadly elliptic, grey-green leaves and dense, flat clusters of white flowers in summer. Height & Spread 50cm (1.5ft).

Sidalcea 'Sussex Beauty' (Prairie Mallow)

Sidalcea 'Sussex Beauty' (Prairie Mallow)

A mid-sized, upright, herbaceous perennial with rounded leaves at its base. In summer, it bears tall spikes of large, candy-pink flowers. Height 1m (3ft), Spread 60cm (2ft).

Silene dioica 'Rollie's Favorite' (Red Campion)

Silene dioica 'Rollie's Favorite' (Red Campion)

A mound-forming, semi-evergreen perennial with ovate to oblong, dark green leaves and, in late spring and early summer, branching, semi-trailing stems bearing clusters of pink flowers with white eyes.

Stachys byzantina 'Silver Carpet' (Woolly Betony)

Stachys byzantina 'Silver Carpet' (Woolly Betony)

A mat forming perennial that is evergreen in mild climates, with oval, woolly, silver-grey leaves, but rarely has flowers. Height 50cm (1.5ft), Spread 1.2m (4ft).

Thalictrum delavayi 'Hewitt's Double' (Chinese Meadow Rue)

Thalictrum delavayi 'Hewitt's Double' (Chinese Meadow Rue)

An erect, clump-forming perennial with slender, purple-flushed stems, deeply-divided green leaves, and panicles of small, double, pale purple flowers in midsummer to early autumn. Height 1.5m (5ft), Spread 50cm (1.5ft).

Tradescantia x andersoniana 'Bilberry Ice'

Tradescantia x andersoniana 'Bilberry Ice'

A tufted, clump-forming, evergreen perennial with branching stems bearing arching, slightly fleshy, dark green leaves and, from early summer into autumn, small clusters of 3-petalled, pale lavender-blue flowers.

Trillium erectum (Birthroot)

Trillium erectum (Birthroot)

A vigorous, upright perennial with erect stems, each bearing a whorl of three pointed, mid-green leaves and, in spring, reddish-purple flowers, sometimes white or yellow, with spreading to slightly recurved petals.

Trollius chinensis 'Golden Queen' (Globeflower)

Trollius chinensis 'Golden Queen' (Globeflower)

An upright herbaceous perennial with dark-green, divided leaves, bearing orange-yellow flowers on tall stems in summer. Height 1m (3ft), Spread 50cm (1.5ft).

Verbascum 'Gainsborough' (Mullein)

Verbascum 'Gainsborough' (Mullein)

A herbaceous perennial with semi-evergreen, grey-green foliage forming at the base of the plant. Tall spikes of pale-lemon flowers are produced in summer. Height 1.5m (5ft), Spread 50cm (1.5ft).

Verbascum olympicum (Olympian Mullein)

Verbascum olympicum (Olympian Mullein)

A tall, rosette-forming biennial or short-lived, evergreen perennial with large, woolly, silver-grey leaves and erect, woolly, silver-grey stems bearing bright golden- yellow flowers in late summer.

Verbascum x hybrida 'Southern Charm'

Verbascum x hybrida 'Southern Charm'

A perennial forming long spikes of flowers in a range of bright colours including apricot, pink, cream and yellow from late spring into early summer. Height & Spread 75cm (2.5ft).

Verbena 'Seabrook's Lavender' (Vervain)

Verbena 'Seabrook's Lavender' (Vervain)

A vigorous, tender, mound-forming to spreading, semi-evergreen perennial with ovate to oblong, toothed, wrinkled, dark green leaves and dense clusters of small, lavender to lavender-pink flowers in summer.

Verbena bonariensis

Verbena bonariensis

A herbaceous perennial that produces heads of bright purple flowers from June until October. Particularly effective if grown in a mass. Height 2.5m (8ft), Spread 50cm (1.5ft).

Verbena bonariensis 'Lollipop'

Verbena bonariensis 'Lollipop'

A stiff, compact, open clump-forming, herbaceous perennial with erect, branching stems bearing lance-shaped, dark green leaves and branched clusters of small purple flowers from midsummer to early autumn.

Verbena bonariensis 'Royal Dreams'

Verbena bonariensis 'Royal Dreams'

A compact, open clump-forming, deciduous perennial with stiff, erect, branching stems bearing dense clusters of small, mauve-pink flowers throughout summer into autumn. Height & Spread 60cm (2ft).

Verbena officinalis var. grandiflora 'Bampton' (Vervain)

Verbena officinalis var. grandiflora 'Bampton' (Vervain)

An upright, open, herbaceous perennial with erect stems bearing dark green leaves, hairy beneath, and long, loose, branched clusters of small, salverform, purple flowers from midsummer to early autumn.

Verbena rigida (Slender Vervain)

Verbena rigida (Slender Vervain)

A perennial with oblong leaves and fragrant, bright purple flowers on branching stems in late summer. Height 1m (3ft), Spread 50cm (1.5ft).

Veronica gentianoides (Gentian Speedwell)

Veronica gentianoides (Gentian Speedwell)

A mat-forming, deciduous to semi-evergreen perennial with rosettes of broadly lance-shaped, sometimes scalloped, dark green leaves and erect racemes of cup-shaped, pale blue flowers in early summer.

Veronicastrum virginicum 'Album' (Culver's Root)

Veronicastrum virginicum 'Album' (Culver's Root)

An upright herbaceous perennial. Its stems are clothed with worled leaves and in late summer, it bears narrow, upright spikes of white flowers. Height 1.2m (4ft), Spread 50cm (1.5ft).

Veronicastrum virginicum 'Apollo' (Culver's Root)

Veronicastrum virginicum 'Apollo' (Culver's Root)

A herbaceous perennial with leafy stems tapering delicately into long lilac-blue racemes tipped with vivid green buds, which bend and curve. Height 1.5m (5ft), Spread 50cm (1.5ft).

Veronicastrum virginicum f. roseum (Pink Culver's Root)

Veronicastrum virginicum f. roseum (Pink Culver's Root)

A tall, erect, herbaceous perennial with whorls of lance-shaped, pointed, toothed, dark green leaves and, from midsummer into early autumn, slender, dense, terminal racemes of tubular, pale pink flowers.

Zantedeschia 'Flamingo' (Arum Lily)

Zantedeschia 'Flamingo' (Arum Lily)

A tender yet vigorous, upright, clump-forming, rhizomatous, semi-evergreen perennial with large, arrow-shaped, dark green leaves and large, funnel-shaped, pale salmon-pink spathes from early summer to early autumn.

Zantedeschia aethiopica 'Green Goddess' (Arum Lily)

Zantedeschia aethiopica 'Green Goddess' (Arum Lily)

A perennial suitable for ponds or bog gardens. It has white spathes, flushed green with yellow spadices held on tall stems above large dark-green leaves. Height 1m (3ft), Spread 50cm (1.5ft).


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