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Herbaceous Perennials

Achillea 'Fanal' (Yarrow)

Achillea 'Fanal' (Yarrow)

A clump-forming, deciduous perennial with finely-divided, grey-green leaves and, in summer, erect, stems bearing dense, flattened corymbs of tiny, red flowers with yellow eyes. Height 75cm (2.5ft), Spread 60cm (2ft).

Achillea 'Saucy Seduction' (Yarrow)

Achillea 'Saucy Seduction' (Yarrow)

An upright, clump-forming, deciduous to semi-evergreen perennial with aromatic, grey-green leaves & erect stems bearing dense, flattened clusters of magenta to deep rose-pink flowers in summer. Height & Spread 60cm (2ft).

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 'Milly Rock Terracotta' (Yarrow)

Achillea millefolium 'Milly Rock Terracotta' (Yarrow)

A compact, mound-forming, deciduous to semi-evergreen perennial with finely-divided, dark grey-green leaves and erect stems bearing dense, flattened clusters of tiny, vibrant, orange-yellow flowers from summer into autumn.

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 '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 '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 '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 'Silver Baby' (African Lily)

Agapanthus 'Silver Baby' (African Lily)

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

Agapanthus 'Snow Crystal' (African Lily)

Agapanthus 'Snow Crystal' (African Lily)

A clump-forming, half-hardy, evergreen perennial with strap-shaped, dark green leaves, and sturdy, erect stems bearing rounded umbels of funnel-shaped, white flowers from midsummer to early autumn.

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 'Tinkerbell' (African Lily)

Agapanthus 'Tinkerbell' (African Lily)

A compact, semi-evergreen perennial forming a clump of strap-shaped, dark grey-green leaves with creamy-white margins and sturdy, upright stems bearing large, spherical heads of tubular blue flowers in late summer.

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).

Agastache 'Blackadder' (Giant Hyssop)

Agastache 'Blackadder' (Giant Hyssop)

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

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.

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 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 'Inticancha Sunset' (Peruvian Lily)

Alstroemeria 'Inticancha Sunset' (Peruvian Lily)

A compact, bushy, clump-forming perennial with upright stems bearing dark green leaves &, from summer into autumn, open clusters of creamy yellow, funnel-shaped flowers with a rich pink splash. 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 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 'Prince Heinrich'

Anemone hupehensis var. japonica 'Prince Heinrich'

A herbaceous perennial with attractively divided green leaves. It bears semi-double rose-pink flowers in summer. Height & Spread 1m (3ft).

Anemone x hybrida 'Andrea Atkinson' (Japanese Anemone)

Anemone x hybrida 'Andrea Atkinson' (Japanese Anemone)

A herbaceous perennial forming clumps of large, dark, divided, vine-line leaves and pure white flowers with contrasting orange-yellow stamens. Height 1.5m (5ft), Spread 1m (3ft).

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 'Blue Star' (Columbine)

Aquilegia 'Blue Star' (Columbine)

An upright, clump-forming, herbaceous perennial with blue-green leaves and upright, wiry stems bearing nodding, spurred, pale violet-blue and white flowers in late spring and early summer. Height & Spread 50cm (1.5ft).

Aquilegia 'Crimson Star' (Columbine)

Aquilegia 'Crimson Star' (Columbine)

An upright, herbaceous perennial with deeply lobed, mid-green leaves and stems bearing pendant flowers with red sepals and creamy white petals from late spring to midsummer. Height 60cm (2ft), Spread 30cm (1ft).

Aquilegia 'Red Star' (Columbine)

Aquilegia 'Red Star' (Columbine)

A short-lived, clump-forming, herbaceous perennial with mid-green leaves and slender, upright stems bearing pendant flowers with red outer sepals and white inner petals in spring and early summer.

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).

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.

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 novi-belgii 'Bahamas' (Michaelmas Daisy)

Aster novi-belgii 'Bahamas' (Michaelmas Daisy)

A compact, bushy perennial with lance-shaped, mid-green leaves & double, incurved, deep blue, light blue, rose, scarlet or white flower heads in summer until autumn. Mildew resistant. Height 60cm (2ft), Spread 30cm (1ft).

Aster novi-belgii 'Barbados' (Michaelmas Daisy)

Aster novi-belgii 'Barbados' (Michaelmas Daisy)

A compact, mound-forming, rhizomatous perennial with branching stems, lance-shaped, mid-green leaves and clusters of pale purple flowers with yellow centres from late summer to mid-autumn. Height & Spread 50cm (1.5ft).

Aster novi-belgii 'Dandy' (Michaelmas Daisy)

Aster novi-belgii 'Dandy' (Michaelmas Daisy)

A dwarf, bushy, clump-forming perennial with slender, branched stems bearing lance-shaped, dark-green leaves and a profusion of intense, violet flowers with yellow centres in late summer to autumn.

Aster novi-belgii 'Samoa' (Michaelmas Daisy)

Aster novi-belgii 'Samoa' (Michaelmas Daisy)

An upright, bushy perennial with lance-shaped, dark green leaves and double, incurved, purple-pink flower heads in summer until autumn. Height 60cm (2ft), Spread 30cm (1ft).

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).

Aster novi-belgii 'Tonga' (Michaelmas Daisy)

Aster novi-belgii 'Tonga' (Michaelmas Daisy)

A compact, bushy, dwarf, clump-forming, perennial with branching stems, lance-shaped, mid-green leaves and clusters of double, bright purple flowers with yellow centres from late summer to mid-autumn.

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

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

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

Astilbe x arendsii '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 'Venice' (Masterwort)

Astrantia major 'Venice' (Masterwort)

An upright, clump-forming perennial with deeply divided, palmate, toothed, mid-green leaves and, in summer, erect stems bearing dark ruby-red flowers surrounded by dark reddish-purple bracts.

Bergenia 'Bressingham Ruby' (Elephant's Ears)

Bergenia 'Bressingham Ruby' (Elephant's Ears)

A clump-forming evergreen perennial with large leaves that turn dark-red in cold weather. Rose-red flowers on red stems in spring. Height 30cm (1ft), Spread 50cm (1.5ft).

Bergenia cordifolia 'Purpurea' (Elephant's Ears)

Bergenia cordifolia 'Purpurea' (Elephant's Ears)

A clump-forming, evergreen perennial with thick, rounded to heart-shaped, dark green leaves, flushed purple in winter. Sturdy, upright, red stems bear cymes of bell-shaped, magenta 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.

Brunnera macrophylla (Siberian Bugloss)

Brunnera macrophylla (Siberian Bugloss)

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

Campanula carpatica 'Blue Clips' (Tussock Bellflower)

Campanula carpatica 'Blue Clips' (Tussock Bellflower)

A small, spreading, mound-forming perennial with light green, heart-shaped leaves and purple-blue flowers from late spring to early autumn. Height & Spread 30cm (1ft).

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).

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).

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).

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 '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).

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 'Black Narcissus' (Cactus Dahlia)

Dahlia 'Black Narcissus' (Cactus Dahlia)

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

Dahlia 'Catherine Deneuve'

Dahlia 'Catherine Deneuve'

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

Dahlia 'Chat Noir'

Dahlia 'Chat Noir'

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

Dahlia 'Crazy Love'

Dahlia 'Crazy Love'

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

Dahlia 'David Howard'

Dahlia 'David Howard'

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

Dahlia 'Engelhardt's Matador'

Dahlia 'Engelhardt's Matador'

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

Dahlia 'Honka Black'

Dahlia 'Honka Black'

An upright, bushy, clump-forming, perennial with green leaves and, from midsummer into autumn, upright stems bearing single, lightly fragrant, star-shaped, dark maroon flowers with rolled petals and golden-yellow centres.

Dahlia 'Honka'

Dahlia 'Honka'

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

Dahlia '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 '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 '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 '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 'Piccolo'

Delphinium 'Piccolo'

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

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).

Echinacea purpurea 'Green Twister' (Coneflower)

Echinacea purpurea 'Green Twister' (Coneflower)

An upright, clump-forming, herbaceous perennial with dark green leaves and, throughout summer, dark stems bearing green-tipped, bright pink flowers with orange-brown central cones. Height 1m (3ft), Spread 50cm (1.5ft).

Echinacea purpurea 'White Swan' (Coneflower)

Echinacea purpurea 'White Swan' (Coneflower)

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

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

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

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

Erigeron 'Azure Fairy' (Fleabane)

Erigeron 'Azure Fairy' (Fleabane)

A clump-forming perennial with lance-shaped leaves and abundant numbers of small, semi-double, yellow-centred, lavendar-blue flowers in summer. Height & Spread 50cm (1.5ft).

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 (Mexican Flebane)

Erigeron karvinskianus (Mexican Flebane)

A mat- or mound-forming, deciduous to semi-evergreen perennial with hairy, dark green leaves and, in summer, daisy-like, white flowers turning pink to purple-pink with age. Height 30cm (1ft), Spread 1m (3ft).

Erodium manescavii (Showy Heron's Bill)

Erodium manescavii (Showy Heron's Bill)

A mat-forming perennial with dark grey-green, dissected leaves and deep pink storksbill flowers over a long season from summer. Height & Spread 60cm (2ft).

Eryngium planum 'Blauer Zwerg' (Sea Holly)

Eryngium planum 'Blauer Zwerg' (Sea Holly)

A perennial forming clumps of branched stems, and cone-like, lilac-blue flowerheads with spiny bracts in late summer. Height & Spread 50cm (1.5ft).

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 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).

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 'Purpurea' (Wood Spurge)

Euphorbia amygdaloides 'Purpurea' (Wood Spurge)

A striking, architectural perennial with dark purple evergreen leaves and contrasting lime-green dome-shaped flowers in spring. Height 30cm (1ft), Spread 60cm (2ft).

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 myrsinites (Broad-Leaved Glaucous Spurge)

Euphorbia myrsinites (Broad-Leaved Glaucous Spurge)

An evergreen perennial with trailing, leafy stems bearing spirally arranged, succulent, blue- to grey-green leaves and bright yellow-green flowers from late spring to midsummer. Height 10cm (4in), Spread 30cm (1ft).

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 'Cherry Brandy'

Gaura lindheimeri 'Cherry Brandy'

A compact, clump-forming, deciduous perennial with upright stems bearing dark green leaves, flushed red when young, and wand-like panicles of star-shaped, pale pink flowers from early summer into autumn.

Gaura lindheimeri 'Rosyjane'

Gaura lindheimeri 'Rosyjane'

A bushy, clump-forming perennial with erect stems bearing small leaves and bi-coloured flowers in white with a picotee edge of cerise-pink blooming from late spring to autumn. Height 75cm (2.5ft), Spread 50cm (1.5ft).

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 '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 sanguineum 'Vision Violet' (Bloody Cranesbill)

Geranium sanguineum 'Vision Violet' (Bloody Cranesbill)

A mat-forming, herbaceous perennial with dark green leaves turning orange-red in autumn, and cup-shaped, purple-pink flowers from late spring into summer with sporadic blooms until autumn. Height & Spread 50ccm (1.5ft).

Geranium sylvaticum 'Mayflower' (Wood Cranesbill)

Geranium sylvaticum 'Mayflower' (Wood Cranesbill)

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

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.

Geranium x oxonianum 'Wargrave Pink'

Geranium x oxonianum 'Wargrave Pink'

An evergreen perennial with a clump-forming habit. Its mid-green leaves are divided into five lobes. From early summer through to autumn it bears pale salmon-pink flowers. Height 60cm (2ft), Spread 1m (3ft).

Geum 'Banana Daiquiri' (Avens)

Geum 'Banana Daiquiri' (Avens)

A mound-forming, deciduous to semi-evergreen perennial with hairy, mid- to dark green basal leaves and slender stems bearing semi-double, yellow flowers from late spring into summer. Height 50cm (1.5ft), Spread 30cm (1ft).

Geum 'Lady Stratheden' (Avens)

Geum 'Lady Stratheden' (Avens)

A herbaceous perennial with mound forming, green, hairy, kidney shaped leaves and semi-double, rich yellow flowers on branched stems throughout 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 'Mrs J. Bradshaw' (Avens)

Geum 'Mrs J. Bradshaw' (Avens)

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

Geum 'Prinses Juliana' (Avens)

Geum 'Prinses Juliana' (Avens)

A clump-forming, deciduous perennial with hairy, lobed, dark green, basal leaves and purple stems bearing semi-double, bright orange flowers in summer. Height & Spread 60cm (2ft).

Helenium autumnale 'Salud Embers' (Sneezeweed)

Helenium autumnale 'Salud Embers' (Sneezeweed)

A compact, upright, deciduous perennial with branching stems bearing hairy, sparsely toothed, dark green leaves and orange-red flowers with yellow edges from summer into autumn. Height & 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 'Catherine Woodbery' (Daylily)

Hemerocallis 'Catherine Woodbery' (Daylily)

A clump-forming, semi-evergreen perennial with green leaves and, in summer, slender, erect stems bearing star-shaped, pale pink to pale lavender-pink flowers with lightly ruffled petals and wide, lime-green throats.

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 'Stella De Oro' (Day Lily)

Hemerocallis 'Stella De Oro' (Day Lily)

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

Hemerocallis fulva var. kwanso (Daylily)

Hemerocallis fulva var. kwanso (Daylily)

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

Heuchera 'Carnival Cocomint' (Alum Root)

Heuchera 'Carnival Cocomint' (Alum Root)

A compact, mound-forming, semi-evergreen to evergreen perennial bearing lobed, rounded, silvery, bright green leaves with dark burgundy veins. Height & Spread 30cm (1ft).

Heuchera 'Forever Red' (Alum Root)

Heuchera 'Forever Red' (Alum Root)

A compact, mound-forming, semi-evergreen perennial bearing rounded, lobed, ruffled, dark red leaves and short, slender, upright stems bearing panicles of white flowers throughout summer. Height & Spread 50cm (1.5ft).

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 'Timeless Night' (Coral Bells)

Heuchera 'Timeless Night' (Coral Bells)

A clump-forming, semi-evergreen perennial forming a small mound of lobed, deep-purple leaves and panicles of pink, globular flowers on purple stems in summer. Height & Spread 50cm (1.5ft).

Heuchera 'Wild Rose' (Alum Root)

Heuchera 'Wild Rose' (Alum Root)

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

Heuchera micrantha 'Palace Purple' (Alum Root)

Heuchera micrantha 'Palace Purple' (Alum Root)

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

Heucherella 'Alabama Sunrise' (Foamy Bells)

Heucherella 'Alabama Sunrise' (Foamy Bells)

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

Heucherella '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.

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 'Guacamole' (Plantain Lily)

Hosta 'Guacamole' (Plantain Lily)

A clump-forming, herbaceous perennial producing a mound of golden-yellow to light green leaves with dark green margins. Funnel-shaped, fragrant, white to lavender flowers bloom on tall stems in summer. Sun tolerant.

Hosta 'Halcyon' (Plantain Lily)

Hosta 'Halcyon' (Plantain Lily)

A compact, mound-forming, deciduous perennial with thick, ovate, blue-green to blue-grey leaves and sturdy, erect scapes bearing bell-shaped, silvery, pale lavender flowers in summer. Height 60cm (2ft), 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 'Patriot' (Plantain Lily)

Hosta 'Patriot' (Plantain Lily)

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

Hosta '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 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).

Houttuynia cordata 'Chameleon' (Heart-Leaved Houttuynia)

Houttuynia cordata 'Chameleon' (Heart-Leaved Houttuynia)

A mat-forming, spreading, herbaceous perennial with showy splashes of cream yellow, pink, & red on the leaves and white flower spikes in late spring. Height 30cm (1ft), Spread 1m (3ft).

Iris 'Alcazar' (Tall Bearded Iris)

Iris 'Alcazar' (Tall Bearded Iris)

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

Iris 'Black Dragon' (Tall Bearded Iris)

Iris 'Black Dragon' (Tall Bearded Iris)

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

Iris 'Bold Print'

Iris 'Bold Print'

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

Iris 'Immortality' (Bearded Iris)

Iris 'Immortality' (Bearded Iris)

A clump-forming, rhizomatous perennial with upright, strap-like, dark green leaves and white flowers with yellow beards blooming in spring and again from late summer to mid-autumn. Height 1m (3ft), Spread 60cm (2ft).

Iris 'Jane Phillips'

Iris 'Jane Phillips'

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

Iris '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 'Rocket'

Iris 'Rocket'

A clump-forming, herbaceous perennial with strap-shaped leaves and sweetly scented, ruffled amber, buff-yellow flowers in spring. Height 75cm (2.5ft), Spread 30cm (1ft).

Iris 'Sultan's Palace'

Iris 'Sultan's Palace'

A clump-forming, rhizomatous perennial with upright, strap-like, grey-green leaves and, in early summer, rich maroon red flowers. Height 75cm (2.5ft), Spread 50cm (1.5ft).

Iris lazica (Lazistan Iris)

Iris lazica (Lazistan Iris)

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

Iris pallida 'Argentea Variegata' (Sweet Iris)

Iris pallida 'Argentea Variegata' (Sweet Iris)

A perennial bearded Iris with semi-evergreen, upright, sword-like foliage that is blue-green striped with cream and white. In early summer it produces fragrant, soft blue flowers. Height 60cm (2ft), Spread 50cm (1.5ft).

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 '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 'Bees' Lemon' (Red Hot Poker)

Kniphofia 'Bees' Lemon' (Red Hot Poker)

A clump-forming, deciduous perennial with toothed, grass-like, mid-green leaves &, in late summer to early autumn, upright racemes of lemon-yellow flowers opening from green buds. 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.

Kniphofia uvaria 'Flamenco' (Red Hot Poker)

Kniphofia uvaria 'Flamenco' (Red Hot Poker)

An evergreen perennial with strap-shaped leaves with yellow, orange or fiery red spikes of tubular flowers from early summer to early autumn. If sown early, will flower early autumn in its first year.

Leucanthemum 'Goldfinch' (Shasta Daisy)

Leucanthemum 'Goldfinch' (Shasta Daisy)

A herbaceous perennial with glossy, dark-green, oblong leaves. Throughout summer it bears semi-double, lemon yellow daisy-like flowers that gradually mature to ivory white. Height 60cm (2ft), Spread 50cm (1.5ft).

Leucanthemum x superbum 'Aglaia' (Shasta Daisy)

Leucanthemum x superbum 'Aglaia' (Shasta Daisy)

A herbaceous perennial with dark green, glossy leaves. In summer and autumn it bears large, white, semi-double, daisy-like flowers with yellow centres. Height 60cm (2ft), 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 'Broadway Lights' (Shasta Daisy)

Leucanthemum x superbum 'Broadway Lights' (Shasta Daisy)

A herbaceous perennial with dark green, glossy leaves and canary yellow, daisy-like flowers which then fade to white in summer and autumn. Height & Spread 50cm (1.5ft).

Leucanthemum x superbum 'LaCrosse' (Shasta Daisy)

Leucanthemum x superbum 'LaCrosse' (Shasta Daisy)

A clump-forming herbaceous perennial with dark green, toothed, lance-shaped leaves. Single white flowers with yellow centres, sometimes spoon shaped petals, flowering for a long period in the summer.

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).

Ligularia stenocephala 'The Rocket' (Golden Groundsel)

Ligularia stenocephala 'The Rocket' (Golden Groundsel)

A herbaceous perennial with large, toothed, heart-shaped, dark green leaves and tall dense racemes of yellow flowers on black stems in summer. Height 2m (6ft), Spread 1m (3ft).

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 'Fire King'

Lilium 'Fire King'

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

Lilium 'Foxtrot' (Asiatic Lily)

Lilium 'Foxtrot' (Asiatic Lily)

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

Lilium 'Inuvik' (Asiatic Lily)

Lilium 'Inuvik' (Asiatic Lily)

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

Lilium regale 'Royal Gold' (Regal Lily)

Lilium regale 'Royal Gold' (Regal Lily)

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

Liriope muscari 'Royal Purple' (Big Blue Lilyturf)

Liriope muscari 'Royal Purple' (Big Blue Lilyturf)

A clump-forming, tuberous, evergreen perennial with arching, glossy, dark green leaves and erect, deep purple flowers in late summer and autumn, followed by bright purple berries. Height 30cm (1ft), Spread 50cm (1.5ft).

Lobelia cardinalis 'Queen Victoria' (Cardinal Flower)

Lobelia cardinalis 'Queen Victoria' (Cardinal Flower)

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

Lobelia x speciosa '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).

Lupinus 'Chandelier' (Lupin)

Lupinus 'Chandelier' (Lupin)

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

Lupinus 'Noble Maiden' (Lupin)

Lupinus 'Noble Maiden' (Lupin)

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

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).

Monarda didyma 'Balmy Lilac' (Bergamot)

Monarda didyma 'Balmy Lilac' (Bergamot)

A compact, mound-forming, herbaceous perennial with aromatic, semi-glossy, dark green leaves and erect stems bearing dense clusters of tubular, deep lilac to lilac-pink flowers in summer. Height & Spread 30cm (1ft).

Monarda didyma 'Balmy Pink' (Bergamot)

Monarda didyma 'Balmy Pink' (Bergamot)

A compact, clump-forming, herbaceous perennial with pointed, toothed, aromatic, dark green leaves and erect stems bearing dense, whorled clusters of tubular, two-lipped, pink flowers in summer. Height & Spread 30cm (1ft).

Monarda didyma 'Balmy Purple' (Bergamot)

Monarda didyma 'Balmy Purple' (Bergamot)

A compact, clump-forming, deciduous perennial with aromatic, dark green leaves and erect stems bearing dense, whorled clusters of tubular, two-lipped, dark magenta to reddish-purple flowers from midsummer into autumn.

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.

Nerine bowdenii (Bowden-Cornish Lily)

Nerine bowdenii (Bowden-Cornish Lily)

A robust, summer-dormant, bulbous perennial with strap-shaped, rich green leaves and, in autumn, usually before the leaves emerge, erect stems bearing open clusters of funnel-shaped, pink flowers.

Paeonia 'Felix Crousse' (Peony)

Paeonia 'Felix Crousse' (Peony)

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

Paeonia 'Shirley Temple' (Double Peony)

Paeonia 'Shirley Temple' (Double Peony)

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

Paeonia lactiflora 'Bowl of Beauty' (Peony)

Paeonia lactiflora 'Bowl of Beauty' (Peony)

A herbaceous perennial with dark green leaves on red stems and large, rose-pink double flowers with a creamy fringed centre in summer. Height 2.5m (8ft), Spread 1.5m (5ft).

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 '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 '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).

Paeonia suffruticosa 'Houki' (Tree Peony)

Paeonia suffruticosa 'Houki' (Tree Peony)

A clump-forming perennial shrub with divided, deep green leaves that turn bronze and purple in autumn. In late spring, it bears large, sweetly fragrant, double, ruby-red flowers with golden stamens.

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 digitalis 'Husker Red'

Penstemon digitalis 'Husker Red'

An upright, bushy, semi-evergreen perennial with lance-shaped, maroon-flushed, dark green leaves and racemes of bell-shaped, pink-flushed, white flowers in summer. Height 1m (3ft), Spread 50cm (1.5ft).

Phlomis fruticosa (Jerusalem Sage)

Phlomis fruticosa (Jerusalem Sage)

A low-growing perennial with sage-like, grey-green ovate leaves and hooded, deep yellow flowers. Height 1m (3ft), Spread 1.5m (5ft).

Phlox paniculata 'Franz Schubert'

Phlox paniculata 'Franz Schubert'

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

Phlox paniculata 'Pink Flame'

Phlox paniculata 'Pink Flame'

A compact, bushy mound-forming, herbaceous perennial with broadly lance-shaped, dark green leaves and, in summer, upright panicles of fragrant, pink flowers with dark pink eyes. Height 50cm (1.5ft), Spread 30cm (1ft).

Phlox paniculata 'Purple Flame'

Phlox paniculata 'Purple Flame'

A compact, upright, clump-forming, herbaceous perennial with dark green leaves, and, from summer into early autumn, upright panicles of fragrant, purple flowers with red eyes. Height & Spread 50cm (1.5ft).

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).

Primula auricula 'Black Jack' (Auricula)

Primula auricula 'Black Jack' (Auricula)

A semi-evergreen, clump-forming, herbaceous perennial with powdery, pale grey leaves. It produces deep burgundy flowers with a white-rimmed yellow center from mid-spring through to summer. Height & Spread 30cm (1ft).

Primula auricula 'Lunar Eclipse' (Auricula)

Primula auricula 'Lunar Eclipse' (Auricula)

A rosette-forming, evergreen perennial with powdery, fleshy, grey-green leaves and, throughout spring, fragrant, double, copper-orange flowers with yellow eyes. Height & Spread 30cm (1ft).

Primula auricula 'Purple Pip' (Auricula)

Primula auricula 'Purple Pip' (Auricula)

An evergreen perennial with rosettes of pale, greyish-green leaves. Clusters of deep red-purple, double flowers appear on short, upright stems in spring. Height & 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 'Blue Ensign' (Lungwort)

Pulmonaria 'Blue Ensign' (Lungwort)

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

Pulmonaria 'Majeste' (Lungwort)

Pulmonaria 'Majeste' (Lungwort)

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

Pulmonaria 'Opal' (Lungwort)

Pulmonaria 'Opal' (Lungwort)

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

Pulmonaria '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 'Trevi Fountain' (Lungwort)

Pulmonaria 'Trevi Fountain' (Lungwort)

A clump-forming, herbaceous perennial that has clumps of green, oval leaves, with silvery blotches. In spring it produces drooping clusters of funnel-shaped, cobalt blue and purplish-pink flowers.

Rodgersia aesculifolia (Chestnut-Leaved Rodgersia)

Rodgersia aesculifolia (Chestnut-Leaved Rodgersia)

A robust, clump-forming, herbaceous perennial with large, deeply veined, palmate, mid-green leaves borne on woolly, red-brown stalks and large panicles of creamy-white or pink flowers in midsummer.

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).

Salvia 'Amethyst Lips' (Sage)

Salvia 'Amethyst Lips' (Sage)

A bushy, evergreen sub-shrub with small, aromatic, mid-green leaves, often turning dark-red in autumn, and racemes of two-lipped, dark purple and white flowers in summer and autumn. Height 1m (3ft), Spread 75cm (2.5ft).

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 'Pink Amistad' (Sage)

Salvia 'Pink Amistad' (Sage)

A tender to borderline hardy, upright, branching perennial with aromatic, mid-green leaves and dark purple stems bearing whorled spikes of fragrant, two-lipped, pink flowers from midsummer to mid-autumn.

Salvia 'Red Swing' (Sage)

Salvia 'Red Swing' (Sage)

A compact, bushy, evergreen sub-shrub or woody-based perennial with aromatic, mid-green leaves and upright, black stems bearing terminal racemes of two-lipped, scarlet flowers from early summer into autumn.

Salvia 'Royal Bumble' (Sage)

Salvia 'Royal Bumble' (Sage)

An upright, bushy evergreen to semi-evergreen subshrub or shrubby perennial with aromatic, mid- to dark green leaves and, from late summer into autumn, dark purple stems bearing whorled, two-lipped, bright red flowers.

Salvia lyrata 'Purple Knockout' (Lyre-Leaf Sage)

Salvia lyrata 'Purple Knockout' (Lyre-Leaf Sage)

A compact, herbaceous perennial, with colourful foliage, burgundy when young, turning purple in summer, and red in autumn. Slender spikes, of small, two-lipped, violet flowers bloom in summer. Height & Spread 30cm (1ft).

Salvia nemorosa 'Caradonna' (Balkan Clary)

Salvia nemorosa 'Caradonna' (Balkan Clary)

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

Salvia nemorosa 'East Friesland' (Balkan Clary)

Salvia nemorosa 'East Friesland' (Balkan Clary)

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

Salvia 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.

Sanguisorba menziesii (Menzies' Burnet)

Sanguisorba menziesii (Menzies' Burnet)

A clump-forming herbaceous perennial with glaucous, scalloped foliage and tall stems bearing dense, oval flower spikes in crimson-maroon in summer and early autumn. Height 1.5m (5ft), Spread 50cm (1.5ft).

Scabiosa 'Butterfly Blue' (Pincushion Flower)

Scabiosa 'Butterfly Blue' (Pincushion Flower)

A mounding, clump-forming perennial with fine cut, grey-green basal leaves. It has pincushion flowers that are lavender blue, standing on erect stems from spring until frost. Height & Spread 50cm (1.5ft).

Scabiosa columbaria 'Pink Mist' (Small Scabious)

Scabiosa columbaria 'Pink Mist' (Small Scabious)

An upright, branched perennial with linear or lobed grey-green leaves and pink flowers with paler centres in summer and early autumn. Height & 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).

Schizostylis coccinea (Kaffir Lily)

Schizostylis coccinea (Kaffir Lily)

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

Sedum 'Mr Goodbud' (Stonecrop)

Sedum 'Mr Goodbud' (Stonecrop)

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

Sedum spectabile 'Autumn Joy' (Stonecrop)

Sedum spectabile 'Autumn Joy' (Stonecrop)

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

Sedum spectabile 'Brilliant' (Ice Plant)

Sedum spectabile 'Brilliant' (Ice Plant)

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

Sedum spectabile 'Herbstfreude' (Stonecrop)

Sedum spectabile 'Herbstfreude' (Stonecrop)

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

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.

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).

Stachys lanata (Lamb's Ears)

Stachys lanata (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 'Nimbus Pink' (Meadow Rue)

Thalictrum 'Nimbus Pink' (Meadow Rue)

A vigorous, erect, clump-forming, deciduous perennial with pinnate, blue-green leaves and dark stems bearing open panicles of tiny, pale pink flowers in summer. Height 75cm (2.5ft), Spread 50cm (1.5ft).

Tiarella 'Pink Skyrocket' (Foam Flower)

Tiarella 'Pink Skyrocket' (Foam Flower)

A clump-forming, deciduous to semi-evergreen perennial bearing rosettes of mid- to dark green leaves with maroon-marked central veins and upright racemes of fluffy, pink flowers in late spring and early summer.

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.

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.

Tricyrtis 'Blue Wonder' (Toad Lily)

Tricyrtis 'Blue Wonder' (Toad Lily)

A compact, clump-forming, perennial with mid- to dark green leaves &, from late summer into autumn, upright stems bearing clusters of star-shaped, blue-flushed, creamy-white flowers, heavily spotted purple or purple-blue.

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.

Tulbaghia violacea 'Silver Lace' (Society Garlic)

Tulbaghia violacea 'Silver Lace' (Society Garlic)

A clump-forming perennial with garlic-scented, cream and grey-green variegated leaves and erect stems bearing large clusters of fragrant, pale purple flowers from midsummer to early autumn. Height & Spread 50cm (1.5ft).

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.

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 'Royal Dreams'

Verbena bonariensis 'Royal Dreams'

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

Veronica gentianoides (Gentian Speedwell)

Veronica gentianoides (Gentian Speedwell)

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

Veronicastrum virginicum 'Fascination' (Culver's Root)

Veronicastrum virginicum 'Fascination' (Culver's Root)

A clump forming, herbaceous perennial with whorls of pointed, green leavs. Long, bent racemes of lavender blue flowers with red eyes appear in summer. Height 1.5m (5ft), Spread 50cm (1.5ft).

Veronicastrum virginicum 'Lavendelturm' (Culver's Root)

Veronicastrum virginicum 'Lavendelturm' (Culver's Root)

A clump forming, herbaceous perennial producing tall clumps of strong stems with whorled serrated leaves around the stem, topped with pale lavender flower spikes in summer. Height 1.5m (5ft), Spread 50cm (1.5ft).

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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