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Herbaceous Perennials

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 '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 filipendulina 'Cloth of Gold' (Yarrow)

Achillea filipendulina 'Cloth of Gold' (Yarrow)

A clump-forming, herbaceous perennial with light-green, finely divided leaves. From late summer to early autumn, it bears flat umbels of golden-yellow flowers. Height 1.5m (5ft), Spread 50cm (1.5ft).

Achillea millefolium 'Cerise Queen' (Yarrow)

Achillea millefolium 'Cerise Queen' (Yarrow)

An upright, semi-evergreen perennial forming a loose clump of finely-divided, deep grey-green leaves and large, flattened clusters of magenta-pink flowers in summer. Height & Spread 60cm (2ft).

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 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 'Black Pantha' (African Lily)

Agapanthus 'Black Pantha' (African Lily)

A clump-forming perennial with green, strap-like leaves and erect, black stems bearing large umbels of tubular, dark blue black flowers in summer that are darker when they open. Height 75cm (2.5ft), 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 'Brilliant Blue' (African Lily)

Agapanthus 'Brilliant Blue' (African Lily)

A compact, clump-forming, half-hardy, semi-evergreen perennial bearing dark green leaves and sturdy, erect stems bearing rounded umbels of trumpet-shaped, deep blue flowers in summer. Height & Spread 50cm (1.5ft).

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 'Double Diamond' (African Lily)

Agapanthus 'Double Diamond' (African Lily)

A compact, clump-forming, evergreen to semi-evergreen perennial with strap-shaped, mid-green leaves, and sturdy, erect stems bearing rounded umbels of double, bell- to funnel-shaped, white flowers in summer.

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 'Fireworks' (African Lily)

Agapanthus 'Fireworks' (African Lily)

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

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 '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 'Poppin' Purple' (African Lily)

Agapanthus 'Poppin' Purple' (African Lily)

A clump-forming, half-hardy, evergreen perennial bearing strap-shaped, dark green leaves and sturdy, erect stems bearing rounded umbels of dark purple buds opening to trumpet-shaped, purple flowers throughout summer.

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 'Snow Cloud' (African Lily)

Agapanthus 'Snow Cloud' (African Lily)

A clump-forming, frost hardy, evergreen perennial with broad, strap-shaped, dark green leaves and sturdy, erect stems bearing dense, spherical umbels of trumpet-shaped, white flowers throughout 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 africanus (African Blue Lily)

Agapanthus africanus (African Blue Lily)

A clump-forming, evergreen perennial with strap-like leaves and umbels of trumpet-shaped, deep blue flowers in late summer. Height 75cm (2.5ft), Spread 50cm (1.5ft).

Agapanthus campanulatus var. albidus (African Lily)

Agapanthus campanulatus var. albidus (African Lily)

An upright perennial with deciduous, narrow, strap-like, grey-green leaves, and tall rounded clusters of white, bell-shaped flowers in summer. Height 60cm (2ft), Spread 50cm (1.5ft).

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 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.

Agastache 'Beelicious Purple' (Lion's Tail)

Agastache 'Beelicious Purple' (Lion's Tail)

A compact, upright, bushy, borderline hardy, deciduous perennial with aromatic, dark green leaves and, from midsummer into autumn, slender spikes of tubular, two-lipped, violet-blue flowers with reddish-purple calyces.

Alcea rosea 'Chater's Double Scarlet' (Hollyhock)

Alcea rosea 'Chater's Double Scarlet' (Hollyhock)

A vigorous, upright biennial or short-lived perennial with lobed, rounded, rough, mid- to dark green leaves and large, double, scarlet-red flowers in summer. Height 2m (6ft), Spread 60cm (2ft).

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.

Alchemilla sericata 'Gold Strike' (Lady's Mantle)

Alchemilla sericata 'Gold Strike' (Lady's Mantle)

A compact, mound-forming, herbaceous perennial with deeply lobed, toothed, softly hairy, grey-green leaves and large, spreading sprays of tiny, bright yellow-green flowers from late spring into summer.

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 hollandicum 'Purple Sensation'

Allium hollandicum 'Purple Sensation'

A bulbous perennial, with strap-shaped, grey-green leaves and small, vivid rosy-purple flowers, in crowded spherical umbels. Height 1m (3ft), Spread 60cm (2ft).

Allium senescens 'Little Sapphire' (German Garlic)

Allium senescens 'Little Sapphire' (German Garlic)

A vigorous, clump-forming, bulbous perennial with strap-shaped, mid-green leaves and erect stems bearing dense umbels of cup-shaped, purple flowers in summer. Height 30cm (1ft), Spread 20cm (8in).

Allium stipitatum 'Violet Beauty' (Persian Shallot)

Allium stipitatum 'Violet Beauty' (Persian Shallot)

A clump-forming, bulbous perennial with glossy, strap-shaped, mid-green leaves and, in summer, sturdy, erect stems bearing dense, dome-shaped umbels of star-shaped, violet flowers in summer.

Alstroemeria 'Inca Goal' (Peruvian Lily)

Alstroemeria 'Inca Goal' (Peruvian Lily)

A compact, upright, clump-forming, tuberous perennial with dark green leaves and, from early summer into autumn, clusters of funnel-shaped, magenta flowers with brown-flecked, yellow-marked inner petals.

Alstroemeria 'Inca Husky' (Peruvian Lily)

Alstroemeria 'Inca Husky' (Peruvian Lily)

A compact, upright, clump-forming, tuberous perennial with dark green leaves and, from early summer to mid-autumn, open clusters of funnel-shaped, apricot flowers with brown-flecked, yellow-marked, inner petals.

Alstroemeria 'Inca Sundance' (Peruvian Lily)

Alstroemeria 'Inca Sundance' (Peruvian Lily)

A compact, bushy, clump-forming, tuberous perennial with lance-shaped, dark green leaves and, from early summer into autumn, funnel-shaped, pale yellow flowers with brown-marked inner petals.

Alstroemeria 'Inca Sweety' (Peruvian Lily)

Alstroemeria 'Inca Sweety' (Peruvian Lily)

A compact, upright, clump-forming, tuberous perennial with green leaves and, from early summer into autumn, clusters of funnel-shaped, flecked, creamy-white flowers with red-pink throats, often flushed green at the tips.

Alstroemeria 'Inca Vito' (Peruvian Lily)

Alstroemeria 'Inca Vito' (Peruvian Lily)

A compact, upright, clump-forming, tuberous perennial with lance-shaped, dark green leaves and, from early summer to mid-autumn, open clusters of funnel-shaped, red flowers with flecked, yellow-marked, inner petals.

Alstroemeria 'Indian Summer' (Peruvian Lily)

Alstroemeria 'Indian Summer' (Peruvian Lily)

An upright, clump-forming, tuberous perennial with bronze- to purple-flushed, dark green leaves and, from early summer to mid-autumn, open clusters of funnel-shaped, red-marked, yellow-orange flowers.

Alstroemeria 'Inticancha Havana' (Peruvian Lily)

Alstroemeria 'Inticancha Havana' (Peruvian Lily)

A compact, upright, clump-forming perennial bearing dark green leaves and, from early summer into autumn, clusters of funnel-shaped, light yellow flowers with brown-flecked inner petals and green-flushed outer petals.

Alstroemeria 'Inticancha Indigo' (Peruvian Lily)

Alstroemeria 'Inticancha Indigo' (Peruvian Lily)

A compact, mound-forming, tuberous perennial with dark green leaves and, from summer into autumn, open clusters of funnel-shaped, black-flecked, purple flowers with white throats. Height & Spread 30cm (1ft).

Alstroemeria 'Inticancha Sunshine' (Peruvian Lily)

Alstroemeria 'Inticancha Sunshine' (Peruvian Lily)

A compact, mound-forming, tuberous perennial with dark green leaves and, from summer into autumn, open clusters of funnel-shaped, brown-flecked, rose-pink flowers with yellow throats. Height & Spread 30cm (1ft).

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 'Blue Ice'

Amsonia 'Blue Ice'

A compact, mound-forming, deciduous perennial with upright stems bearing dark green leaves turning yellow-orange in autumn and rounded, open panicles of star-shaped, lavender-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 hupehensis 'Praecox' (Japanese Anemone)

Anemone hupehensis 'Praecox' (Japanese Anemone)

An erect, clump-forming, herbaceous perennial with deeply divided, dark green basal leaves and, from late summer into autumn, upright, wiry stems bearing single, deep pink flowers with yellow centres.

Anemone hupehensis var. japonica 'Bressingham Glow'

Anemone hupehensis var. japonica 'Bressingham Glow'

An erect, clump-forming, herbaceous perennial with deeply divided, mid-green basal leaves and, from late summer to early autumn, upright, wiry stems bearing semi-double, deep rose-pink flowers with yellow centres.

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).

Angelica gigas (Korean Angelica)

Angelica gigas (Korean Angelica)

A large short lived herbacous perennial with attractive divided foliage. In late summer to early autumn, it bears large rounded umbels of purple flowers on red-flushed, branching stems. Height & Spread 1.2m (4ft).

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 'Kristall' (Columbine)

Aquilegia 'Kristall' (Columbine)

A strong growing herbaceous perennial with green-blue divided foliage and nodding, pure white flowers on upright stems from late spring until early summer. Height & Spread 50cm (1.5ft).

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 'Blue Barlow' (Columbine)

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

An erect, clump-forming, herbaceous perennial with divided, dark green leaves and nodding, spurless, double, violet-blue flowers 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).

Aquilegia vulgaris var. stellata 'White Barlow'

Aquilegia vulgaris var. stellata 'White Barlow'

An erect, clump-forming, herbaceous perennial with divided, dark grey-green leaves and nodding, spurless, double, white flowers from late spring into summer. Height 75cm (2.5ft), Spread 50cm (1.5ft).

Armeria maritima 'Splendens' (Thrift)

Armeria maritima 'Splendens' (Thrift)

A compact, dense, tufted, evergreen perennial with stiff, grass-like dark green leaves and slender, erect, stems bearing compact, ruonded clusters of reddish-pink flowers from mid-spring into summer.

Armeria pseudarmeria 'Dreameria Daydream' (Great Thrift)

Armeria pseudarmeria 'Dreameria Daydream' (Great Thrift)

An evergreen perennial forming a clump of lance-shaped leaves. From late spring until late summer it produces spherical, pink flowerheads held on strong stems. Height & 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 novi-belgii 'Jenny' (Michaelmas Daisy)

Aster novi-belgii 'Jenny' (Michaelmas Daisy)

A compact, mound-forming, deciduous perennial with narrowly lance-shaped, dark green leaves and clusters of semi-double, magenta flowers from late summer into autumn. Height & Spread 50cm (1.5ft).

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 'Snow Cushion' (Michaelmas Daisy)

Aster novi-belgii 'Snow Cushion' (Michaelmas Daisy)

A compact, mound-forming perennial with narrow, green leaves and clusters of white daisy-like flowers with yellow centres in late summer and autumn. Height & Spread 50cm (1.5ft).

Astilbe 'Bumalda'

Astilbe 'Bumalda'

A clump-forming, deciduous perennial with toothed, deeply-divided, red-bronze-flushed, dark green leaves &, in summer, upright, branched panicles of white flowers that age pale pink. Height 60cm (2ft), Spread 50cm (1.5ft).

Astilbe 'Deutschland'

Astilbe 'Deutschland'

An upright, clump-forming perennial with feathery green foliage, which unfurls in spring, followed in late summer with plumes of white flowers. Height 1m (3ft), Spread 60cm (2ft).

Astilbe japonica 'Washington'

Astilbe japonica 'Washington'

A perennial with feathery, deeply divided green foliage which unfurls in spring, followed in late summer with plumes of creamy white flowers. Height 1m (3ft), Spread 60cm (2ft).

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).

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 'Harzkristall' (Elephant's Ears)

Bergenia 'Harzkristall' (Elephant's Ears)

A compact, clump-forming, evergreen perennial bearing rounded, toothed, glossy, dark green leaves and stiff, upright, reddish-brown stems bearing dense clusters of open bell-shaped, pink-flushed, white flowers in spring.

Brunnera macrophylla 'Sea Heart' (Siberian Bugloss)

Brunnera macrophylla 'Sea Heart' (Siberian Bugloss)

A mound-forming, rhizomatous perennial, bearing large, heart-shaped, silver-marked, dark green leaves and, in spring, airy panicles of small, lightly fragrant, blue flowers fading pink or lavender with age.

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 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).

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 'Tropicanna Black'

Canna 'Tropicanna Black'

An erect, rhizomatous perennial with large, banana-like, dark maroon leaves and strong, erect stems bearing racemes of bright orange-red flowers from summer to early autumn. Height 2m (6ft), Spread 75cm (2.5ft).

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 '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).

Centranthus ruber 'Alba Pura' (Valerian)

Centranthus ruber 'Alba Pura' (Valerian)

An upright, semi-evergreen perennial, sometimes grown as a biennial, with grey-green leaves & dense cymes of small, fragrant, funnel-shaped, white flowers from late spring into summer. Height 1m (3ft), 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.

Convallaria majalis (Lily Of The Valley)

Convallaria majalis (Lily Of The Valley)

A perennial with elliptic to narrowly ovate leaves and arching racemes of small, highly fragrant, bell-shaped flowers followed by red berries. Height & Spread 50cm (1.5ft).

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 'Hellfire' (Montbretia)

Crocosmia 'Hellfire' (Montbretia)

A robust perennial with pleated mid-green leaves and arching stems of bold red flowers in summer. Height 1.5m (5ft), Spread 1m (3ft).

Crocosmia 'Lucifer' (Montbretia)

Crocosmia 'Lucifer' (Montbretia)

A robust, spreading perennial with pleated mid-green leaves and arching stems of bold tomato-red flowers in summer. Height 1.5m (5ft), Spread 1m (3ft).

Crocosmia x crocosmiiflora 'George Davison' (Montbretia)

Crocosmia x crocosmiiflora 'George Davison' (Montbretia)

A clump-forming, deciduous perennial with erect, sword-shaped, dark green leaves and branched stems bearing spikes of yellow-orange flowers in summer. Height 1m (3ft), Spread 10cm (4in).

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 Leicester'

Dahlia 'Bishop of Leicester'

A bushy, clump-forming, tuberous perennial with toothed, purple- to black-flushed, dark green leaves and, from midsummer to early autumn, pale lavender flowers with darker lavender bands down the centre of each petal.

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 '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 '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 '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 '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).

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 'Dark Blue White Bee'

Delphinium '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 '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 '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 'Guardian White'

Delphinium 'Guardian White'

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

Delphinium 'Light Blue with White Bee'

Delphinium 'Light Blue with White Bee'

An upright, clump-forming perennial with palmately lobed, dark green leaves and, in summer, dense, erect, branching racemes of bowl-shaped, semi-double, pale blue flowers with white centres.

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.

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 (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 'Excelsior Hybrid' (Foxglove)

Digitalis purpurea 'Excelsior Hybrid' (Foxglove)

A biennial plant, forming a basal clump of leaves then tall, upright spikes of white, yellow, pink or purple, bell-shaped flowers. Height 1.5ft (5ft), Spread 50cm (1.5ft).

Digitalis purpurea 'Virtuoso Rose Compact' (Foxglove)

Digitalis purpurea 'Virtuoso Rose Compact' (Foxglove)

A compact biennial or short-lived perennial with toothed green leaves. Tall spikes bear large, tubular to bell-shaped rose pink flowers with heavily spotted throats, from mid to late summer. Height & Spread 50cm (1.5ft).

Digitalis purpurea 'Virtuoso White' (Foxglove)

Digitalis purpurea 'Virtuoso White' (Foxglove)

A biennial or short-lived perennial with toothed green leaves. Tall spikes bear large, tubular to bell-shaped creamy white flowers with purple spotted throats, from mid to late summer. Height 1m (3ft), Spread 50cm (1.5ft).

Digitalis x valinii 'Foxlight Plum Gold' (Foxglove)

Digitalis x valinii 'Foxlight Plum Gold' (Foxglove)

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

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.

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 'Magnus' (Coneflower)

Echinacea purpurea 'Magnus' (Coneflower)

An upright, clump-forming perennial with toothed, dark green leaves and large, purple-pink petals surrounding a dark orange cone in midsummer to mid-autumn. Height 1m (3ft), Spread 60cm (2ft).

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.

Echinacea purpurea (Coneflower)

Echinacea purpurea (Coneflower)

An upright perennial with large, daisy-like flowers that have a brown centres and pale purple petals. Height 1.5m (5ft), Spread 50cm (1.5ft).

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).

Echium pininana (Giant Viper's Bugloss)

Echium pininana (Giant Viper's Bugloss)

A biennial producing a low rosette of silvery-green, lance-shaped leaves in its first year. In its second year, it bears large spires of blue flowers on stout stems. Height 3m (10ft), Spread 1m (3ft).

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 'Lavender Lady' (Mexican Fleabane)

Erigeron karvinskianus 'Lavender Lady' (Mexican Fleabane)

A mat- or mound-forming, deciduous to semi-evergreen perennial with hairy, elliptic to lance-shaped, dark green leaves and, in summer, daisy-like, soft lavender-coloured flowers. Height 30cm (1ft), Spread 60cm (2ft).

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 'Blue Hobbit' (Sea Holly)

Eryngium planum 'Blue Hobbit' (Sea Holly)

A herbaceous perennial with spiny edged leaves and masses of spiky, cone-like, bright purple-blue flowers on strong stems in summer and autumn. Height 1m (3ft), Spread 50cm (1.5ft).

Eryngium planum (Sea Holly)

Eryngium planum (Sea Holly)

A clump-forming, evergreen perennial with rosettes of toothed, dark grey-green leaves and, in summer, upright, branched stems bearing cone-like, light blue flower-heads with conspicuous, linear, spiny, blue-green bracts.

Eryngium variifolium (Moroccan Sea Holly)

Eryngium variifolium (Moroccan Sea Holly)

An erect herbaceous perennial with, white-marbled, dark green leaves and grey-blue to pale blue, teasel-like flowers in summer. Height 1m (3ft), Spread 50cm (1.5ft).

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 amygdaloides var. robbiae (Mrs Robb's Bonnet)

Euphorbia amygdaloides var. robbiae (Mrs Robb's Bonnet)

A spreading, evergreen perennial with rosettes of oblong, leathery, glossy, dark green leaves and cymes of yellow-green flowers from mid-spring to early summer. Height 50cm (1.5ft), Spread 1m (3ft).

Euphorbia characias subsp. wulfenii 'Shorty'

Euphorbia characias subsp. wulfenii 'Shorty'

An upright, bushy, evergreen perennial or subshrub bearing dense whorls of linear, blue-green leaves, flushed red when young, and, in spring, small green flowers surrounded by large, bright yellow to yellow-green bracts.

Euphorbia characias subsp. wulfenii (Mediterranean Spurge)

Euphorbia characias subsp. wulfenii (Mediterranean Spurge)

An upright, evergreen shrub with biennial shoots bearing linear to oblong, grey-green leaves and dense, spherical to cylindrical cymes of yellow-green flowers from early spring to early summer. Height & Spread 1.2m (4ft).

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 'Azure Rush'

Geranium 'Azure Rush'

A compact, mound-forming, herbaceous perennial with rounded, deeply-lobed, dark green leaves and erect, branching stems bearing single, cup-shaped, veined, lavender-blue flowers from summer into autumn.

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 'Johnson's Blue'

Geranium 'Johnson's Blue'

A vigorous, clump-forming perennial with lobed leaves and long-stems bearing rounded, dark-veined, lavender-blue flowers throughout summer. Height 50cm (1.5ft), Spread 1m (3ft).

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 'Rozanne' (Cranesbill)

Geranium 'Rozanne' (Cranesbill)

A mound-forming perennial with marbled leaves that have a soft velvety texture and large, cupped, blue flowers with white centres and maroon veins in late summer. Height 60cm (2ft), Spread 1m (3ft).

Geranium clarkei 'Kashmir White'

Geranium clarkei 'Kashmir White'

A spreading herbaceous perennial with divided leaves and small white flowers veined with purple-pink in summer. Height 50cm (1ft), Spread 1m (3ft).

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 'Spessart' (Big-Root Cranesbill)

Geranium macrorrhizum 'Spessart' (Big-Root Cranesbill)

A vigorous, mound-forming, semi-evergreen perennial with aromatic, lobed, toothed, light green leaves turning red in autumn and umbel-like clusters of flat, white, pink, or purple-pink flowers in summer.

Geranium phaeum var. phaeum 'Samobor' (Dusky Cranesbill)

Geranium phaeum var. phaeum 'Samobor' (Dusky Cranesbill)

A clump-forming, herbaceous perennial with upright, branched stems bearing lobed, gray-green foliage with dark markings and purple-brown flowers in late spring and early summer. Height 60cm (2ft), Spread 75cm (2.5ft).

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).

Geranium x cantabrigiense 'Biokovo' (Mountain Cranesbill)

Geranium x cantabrigiense 'Biokovo' (Mountain Cranesbill)

A compact, slowly spreading, evergreen perennial with aromatic, glossy, light green leaves, turning red and yellow in autumn, and dense clusters of flat, pink-flushed, white flowers from late spring to late summer.

Geum 'Borisii' (Avens)

Geum 'Borisii' (Avens)

A clump-forming perennial with upright, hairy, mid-green leaves and orange-red flowers on upright stems in late spring to late summer. Height 50cm (1.5ft), Spread 30cm (1ft).

Geum 'Coral Tempest' (Avens)

Geum 'Coral 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, salmon to orange-red 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 '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 '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 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.

Helenium 'Moerheim Beauty' (Sneezeweed)

Helenium 'Moerheim Beauty' (Sneezeweed)

An upright, clump-forming perennial with lance-shaped green leaves and large, dark-centred, copper-red flowers in summer. 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.

Hemerocallis 'Bonanza' (Daylily)

Hemerocallis 'Bonanza' (Daylily)

A herbaceous perennial with long, strap-like green leaves and large, golden-orange flowers distinctively marked with a red throat in summer. Height 75cm (2.5ft), Spread 1m (3ft).

Hemerocallis 'Crimson Pirate' (Daylily)

Hemerocallis 'Crimson Pirate' (Daylily)

A clump forming, herbaceous perennial with green, strap-like leaves and striking, vivid red flowers with a yellow throat in late summer. Height & Spread 1m (3ft).

Hemerocallis 'Frans Hals' (Daylily)

Hemerocallis 'Frans Hals' (Daylily)

A clump forming, herbaceous perennial with green, strap-like leaves and bicolour rust and orange flowers throughout summer. Height 75cm (2.5ft), Spread 60cm (2ft).

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).

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 'Black Taffeta' (Alum Root)

Heuchera 'Black Taffeta' (Alum Root)

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

Heuchera 'Chocolate Ruffles' (Alum Root)

Heuchera 'Chocolate Ruffles' (Alum Root)

A perennial forming heart shaped, chocolate brown leaves on top with burgundy undersides peeking out from each ruffle and sprays of white, tubular-shaped flowers on purple stems. Height & Spread 30cm (1ft).

Heuchera 'Grape Timeless' (Alum Root)

Heuchera 'Grape Timeless' (Alum Root)

A compact, mound-forming, semi-evergreen to evergreen perennial bearing purple leaves with dark veins and slender, upright stems bearing panicles of star-shaped, bright rose-pink flowers from mid-spring into summer.

Heuchera 'Indian Summer Boysenberry' (Alum Root)

Heuchera 'Indian Summer Boysenberry' (Alum Root)

A compact, mound-forming, semi-evergreen perennial bearing rounded, ruffled, lobed, reddish-brown to orange-red leaves, and upright stems bearing panicles of small, bell-shaped, white flowers from late spring into 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 'Wildberry'

Heuchera 'Wildberry'

A compact, mound-forming, semi-evergreen to evergreen perennial bearing glossy, rich, deep purple leaves with dark veins and upright stems bearing tiny, star-shaped, creamy-white flowers from late spring into summer.

Heuchera americana 'Plum Pudding' (Alum Root)

Heuchera americana 'Plum Pudding' (Alum Root)

A low-growing perennial that forms heart shaped, lobed, plum leaves with darker plum veining and panicles of white, tubular-shaped flowers on purple stems. Height & Spread 50cm (1.5ft).

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 '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 'Tapestry' (Foamy Bells)

Heucherella 'Tapestry' (Foamy Bells)

A compact, clump-forming, semi-evergreen perennial bearing mounds of blue-green leaves with dark purple veins & silver highlights, turning greener in autumn and slender stems bear pink flowers from late spring into summer.

Hosta 'August Moon' (Plantain Lily)

Hosta 'August Moon' (Plantain Lily)

A medium to large sized, mounding, deciduous perennial with large, heart-shaped, gold foliage with slightly rippled margins and white to pale lavender flowers in summer. Height 60cm (2ft), Spread 1m (3ft).

Hosta 'Diana Remembered' (Plantain Lily)

Hosta 'Diana Remembered' (Plantain Lily)

A clump-forming, herbaceous perennial bearing broadly ovate, lightly puckered, grey-green leaves with wide, irregular, creamy-white margins and slender scapes bearing racemes of fragrant, tubular, white flowers in summer.

Hosta 'Frances Williams' (Plantain Lly)

Hosta 'Frances Williams' (Plantain Lly)

A clump-forming perennial with heart-shaped, puckered and veined grey-green leaves with wide yellow-green edges. Pale lilac flowers form in compact racemes. Height & Spread 1m (3ft).

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 '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 'Wide Brim' (Plantain Lily)

Hosta 'Wide Brim' (Plantain Lily)

A perennial with a clump-forming habit. Its heart-shaped leaves are dark-green margined with creamy-yellow. In summer it bears funnel-shaped, pale lavender flowers on erect stems. Height 50cm (1.5ft), Spread 1m (3ft).

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 '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 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 'Butter and Sugar' (Siberian Iris)

Iris sibirica 'Butter and Sugar' (Siberian Iris)

A clump-forming, herbaceous perennial with upright, strap-like, grey-green leaves and tall, erect stems bearing white flowers with yellow falls in late spring. Height & Spread 60cm (2ft).

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).

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).

Knautia macedonica (Macedonian Scabious)

Knautia macedonica (Macedonian Scabious)

An upright, clump-forming herbaceous perennial with slender, branched, leafy stems, pinnately lobed basal leaves and a profusion of long-lasting, dark red flowerheads in summer. Height 75cm (2.5ft), Spread 50cm (1.5ft).

Kniphofia 'Ice Queen' (Red Hot Poker)

Kniphofia 'Ice Queen' (Red Hot Poker)

A vigorous, upright, deciduous perennial with strap-shaped, dark green leaves and sturdy, erect, stems bearing spikes of green buds opening to tubular, pale yellow flowers in autumn. Height 1.5m (5ft), Spread 75cm (2.5ft).

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.

Kniphofia 'Nancy's Red' (Red Hot Poker)

Kniphofia 'Nancy's Red' (Red Hot Poker)

A clump-forming, upright perennial with tall stems, grassy green leaves, and tubular spikes of dusty red-orange flowers in summer. Height & Spread 50cm (1.5ft).

Kniphofia 'Royal Castle' (Red Hot Poker)

Kniphofia 'Royal Castle' (Red Hot Poker)

A vigorous, upright, evergreen or semi-evergreen perennial with strap-shaped, dark green leaves and sturdy, erect, stems bearing spikes of bright orange, red, or yellow flowers from summer into autumn.

Kniphofia citrina (Yellow Red Hot Poker)

Kniphofia citrina (Yellow Red Hot Poker)

A clump-forming, evergreen perennial with upright to arching green leaves and, from late spring into summer, erect stems bearing bright green buds opening to tubular, yellow-green flowers turning yellow-orange with age.

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 'Becky' (Shasta Daisy)

Leucanthemum x superbum 'Becky' (Shasta Daisy)

A vigorous, upright, clump-forming, herbaceous perennial with mid-green basal leaves and, from midsummer into autumn, upright stems bearing large, white flowers with yellow centres. Height & Spread 1m (3ft).

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 '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 '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 '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).

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 '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 'Desert Sun' (Lupin)

Lupinus 'Desert Sun' (Lupin)

A vigorous, upright, clump-forming, herbaceous perennial with palmate, dark green leaves and large, erect, terminal racemes of creamy-white buds opening to yellow flowers in summer. Height 75cm (2.5ft), Spread 60cm (2ft).

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 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 'King Canute' (Lupin)

Lupinus 'King Canute' (Lupin)

A vigorous, upright, clump-forming, herbaceous perennial with palmate, mid- to bright green leaves and large, erect, terminal racemes of dark blue and white flowers in summer. Height 75cm (2.5ft), Spread 50cm (1.5ft).

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 'Polar Princess' (Lupin)

Lupinus 'Polar Princess' (Lupin)

A compact, clump-forming perennial with palmate, mid-green leaves and tall, upright, terminal racemes of white flowers in summer. Height & Spread 75cm (2.5ft).

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 '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).

Nepeta 'Six Hills Giant' (Catmint)

Nepeta 'Six Hills Giant' (Catmint)

A hardy perennial with aromatic, grey-green foliage and short, purple flower spikes in summer. Height & Spread 1m (3ft).

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 'Monsieur Jules Elie' (Peony)

Paeonia 'Monsieur Jules Elie' (Peony)

An upright, bushy, herbaceous perennial with dark green leaves and, from late spring into summer, strong, erect stems bearing large, rounded, double, deep rose-pink flowers with a silvery sheen. Height & Spread 1m (3ft).

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 'Doctor Alexander Fleming' (Peony)

Paeonia lactiflora 'Doctor Alexander Fleming' (Peony)

A clump-forming, herbaceous perennial bearing red-mottled stems, dark green leaves with lance-shaped leaflets and, in summer, fragrant, double, rose-pink flowers with curled inner petals. 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 'Karl Rosenfield' (Peony)

Paeonia lactiflora 'Karl Rosenfield' (Peony)

A herbaceous perennial with attractive, divided, mid-green leaves. In late spring and early summer, it bears large, double, crimson flowers. 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 nudicaule (Arctic Poppy)

Papaver nudicaule (Arctic Poppy)

A short-lived perennial, often grown as an annual, with large, papery, bowl-shaped, lightly fragrant flowers. Varieties come in flower shades of yellow, orange, salmon, rose, pink, cream and white.

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).

Persicaria affinis 'Darjeeling Red' (Knotweed)

Persicaria affinis 'Darjeeling Red' (Knotweed)

A mat-forming, semi-evergreen perennial with large, elliptic to lance-shaped, dark green leaves and, from midsummer to mid-autumn, erect spikes of pink flowers that turn red as they mature.

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).

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).

Polygonatum multiflorum (Solomon's Seal)

Polygonatum multiflorum (Solomon's Seal)

A herbaceous perennial with arching stems and bright-green, elliptic leaves. In early summer, it bears white, bell-shaped flowers that are suspended beneath its leaves. Height 1.2m (4ft), Spread 50cm (1.5ft).

Primula vialii (Vial's Primrose)

Primula vialii (Vial's Primrose)

An herbaceous perennial with heavily veined, oblong leaves forming a basal rosette. In early to mid-summer, it produces a single red-tipped, violet flower spike held on an upright stem.

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 'Pretty in Pink' (Lungwort)

Pulmonaria 'Pretty in Pink' (Lungwort)

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

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 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 'Summerina Orange' (Coneflower)

Rudbeckia 'Summerina Orange' (Coneflower)

An upright, bushy, clump-forming, herbaceous perennial with dark green leaves and, from early summer into autumn, daisy-like, orange flowers with red-ringed, central brown cones. Height & Spread 50cm (1.5ft).

Rudbeckia fulgida var. deamii (Deam's Coneflower)

Rudbeckia fulgida var. deamii (Deam's Coneflower)

A clump-forming, herbaceous perennial with ovate, rough, dark-green leaves and upright, leafy stems bearing daisy-like, golden-yellow flowers from late summer to mid-autumn. Height 75cm (2.5ft), Spread 50cm (1.5ft).

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 hirta 'Sunbeckia Alicia' (Black-Eyed Susan)

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

An erect, clump-forming, half-hardy biennial or short-lived perennial with ovate, toothed, dark green leaves and golden-yellow flowers with dark orange markings and a dark brown centre from summer into autumn.

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

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

An erect, clump-forming, half-hardy biennial or short-lived perennial with ovate, toothed, dark green leaves & golden-yellow flowers with orange-brown markings 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 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 'African Sky' (Sage)

Salvia 'African Sky' (Sage)

An upright, deciduous to semi-evergreen perennial with aromatic, mid- to bright green leaves and, from midsummer into autumn, open whorls of tubular, two-lipped flowers with violet-blue upper petals and paler lower petals.

Salvia 'Amistad' (Sage)

Salvia 'Amistad' (Sage)

An upright, branching, woody-based perennial with ovate, hairy, toothed, aromatic, mid-green leaves and dark purple stems bearing whorled spikes of fragrant, two-lipped, dark purple flowers from early summer into autumn.

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 '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 'Love and Wishes' (Sage)

Salvia 'Love and Wishes' (Sage)

An upright, bushy, tender evergreen sub-shrub with ovate to elliptic, aromatic, dark green leaves and, from early summer into autumn, dark stems bearing open racemes of magenta flowers with maroon calyxes.

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 nemorosa 'Sensation Blue' (Balkan Clary)

Salvia nemorosa 'Sensation Blue' (Balkan Clary)

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

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 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 '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).

Sanguisorba 'Little Angel' (Great Burnet)

Sanguisorba 'Little Angel' (Great Burnet)

A compact, clump-forming perennial bearing dark green leaves with creamy-white margins and slender, erect, branching stems bearing oval spikes of deep maroon flowers throughout summer. Height & Spread 60cm (2ft).

Saxifraga umbrosa (London Pride)

Saxifraga umbrosa (London Pride)

An evergreen rosette former with spoon-shaped, waxy-edged leaves and tall airy spikes of starry white flowers with red speckling in summer. Height 30cm (1ft), Spread 1m (3ft).

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).

Scabiosa incisa 'Kudo' (Scabious)

Scabiosa incisa 'Kudo' (Scabious)

A mound-forming, deciduous biennial or short-lived perennial with finely-divided, dark grey-green leaves and upright stems bearing pink flower heads from early summer into autumn. Height 50cm (1.5ft), Spread 60cm (2ft).

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).

Senecio candicans 'Angel Wings' (Marine Cineraria)

Senecio candicans 'Angel Wings' (Marine Cineraria)

An upright, bushy, borderline hardy, evergreen subshrub, often grown as an annual, with large, broadly ovate, scalloped, felted, bright silvery-grey leaves and inconspicuous clusters of yellow flowers in summer.

Sidalcea 'Elsie Heugh' (Prairie Mallow)

Sidalcea 'Elsie Heugh' (Prairie Mallow)

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

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).

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).

Stachys byzantina (Lamb's Ears)

Stachys byzantina (Lamb's Ears)

A low, spreading, evergreen perennial. It has soft woolly light-grey leaves and in mid-summer, produces downy spikes of small light purple flowers which are appealing to bees. Height 60cm (2ft), Spread 1m (3ft).

Thalictrum aquilegiifolium (Rue)

Thalictrum aquilegiifolium (Rue)

An erect, clump-forming, rhizomatous, herbaceous perennial with grey-green leaves and upright stems bearing large, flat-topped, panicles of fluffy, pale mauve to purple-pink flowers in summer.

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).

Tiarella 'Spring Symphony' (Foam Flower)

Tiarella 'Spring Symphony' (Foam Flower)

A low-growing, creeping perennial which makes a good ground cover plant. It has deep green, palmate foliage and in spring it has slender stems that rise above the foliage with light pink, star-shaped foamy flowers on top.

Tiarella cordifolia (Foam Flower)

Tiarella cordifolia (Foam Flower)

A herbaceous perennial with lobed basal leaves and short upright spikes of foamy flowers in late spring and early summer. Height & Sread 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.

Verbascum chaixii 'Album' (White Nettle-Leaved Mullein)

Verbascum chaixii 'Album' (White Nettle-Leaved Mullein)

A clump-forming perennial with grey hairy leaves and white flowers with purple centres, in late summer. Height 1m (3ft), 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 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.

Zantedeschia 'Sumatra' (Calla Lily)

Zantedeschia 'Sumatra' (Calla Lily)

A compact, clump-forming, tuberous perennial with upright, green leaves which are spotted and streaked with white and edged with a thin line of purple. Purple flowers are borne erect on sturdy stems in summer.

Zantedeschia 'Sunclub' (Arum Lily)

Zantedeschia 'Sunclub' (Arum Lily)

A compact, clump-forming, tuberous perennial with wavy-edged, upright green leaves streaked and spotted with white. Bright yellow flowers are borne on sturdy stems in summer. Height & Spread 50cm (1.5ft).

Zantedeschia 'Zazu' (Calla Lily)

Zantedeschia 'Zazu' (Calla Lily)

A compact, clump-forming, tuberous perennial with wavy-edged, upright green leaves streaked and spotted with white. Vibrant pink flowers are borne on sturdy stems in summer. Height & Spread 60cm (2ft).

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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