Aconitum carmichaelii 'Arendsii' (Monkshood 'Arendsii'): Tall spires of hooded rich blue flowers in late summer. Attractive foliage spring to autumn. To 1.5m. Hardy. [Collect Only]

Angelica gigas: Magnificent plant with huge domes of purple flowers in summer, and attractive seed heads. Biennial/short-lived perennial. Up to 2m.

Anthriscus sylvestris 'Ravenswing' (Purple cow parsley): A dark leaved form of the common cow parsley. To 1.5m. Hardy. Tends to be biennial.

Aster laevis 'Arcturus' (Syn. Symphyotrichum laeve 'Arcturus'): Clouds of lilac/purple flowers over almost black stems. Hardy and reliable late summer/autumn flowerer. Hardy. Up to 1.3m.

Calamagrostis x acutiflora 'Karl Foerster' (Feather-reed grass 'Karl Foerster'): Deciduous grass which forms upright clumps, flowering purplish in June/July, fading to gold then blond through winter. Hardy. Up to 1.8m. [Collect Only]

Campanula lactiflora 'Loddon Anna' (Milky bellflower 'Loddon Anna'): Tall stems topped with clusters of palest pink flowers in mid-summer. Excellent for filling out a border and adding height. To 1.5m. Hardy.

Campanula lactiflora 'Prichards Variety' (Milky bellflower 'Prichards Variety'): Clusters of warm blue flowers on tall stems in mid-summer. To 1.5m. Hardy.

Centaurea macrocephala (Giant knapweed): Huge, bright yellow almost fluffy flowers in mid-summer follow attractive papery buds. Attractive to bees. Height to 1.5m. Hardy.

Cephalaria gigantea (Giant scabious): Very tall wavy stems topped with large lemon yellow scabious-like flowers.Easy to grow. May need staking or support. Hardy. Up to 2m.

Cichorium intybus f. album (Chicory- white form): White flowered form of wild chicory. Tall stems, flat white flowers in late summer. Needs a bit of support. Hardy. Up to 2m.

Cichorium intybus f. roseum (Chicory- pink form): Pink flowered form of wild chicory. Tall stems, flat pink flowers in late summer. Up to 2m. Hardy. [Collect Only]

Cirsium rivulare 'Atropurpureum' (Brook thistle): Deep red thistle flowers held above typical thistley foliage. Very attractive to bees. Very good garden plant. To 1.2m. Hardy

Cirsium rivulare 'Frosted Magic' (Brook thistle 'Frosted Magic'): A brand new variety for 2016. White thistle flowers held above typical thistley foliage.To 1.2m. Hardy

Cirsium rivulare 'Trevor's Blue Wonder' (Brook thistle 'Trevor's Blue Wonder'): Not blue at all, I'm afraid, but a more purplish hued form of the more familiar deepest pink Cirsium rivulare 'Atropurpureum'. Hardy. To 1.5m

Cynara cardunculus 'Cardy': New form of Cynara, larger flowers good as a cut-flower. Tall silver leaved plant topped with large purple thistle flowers. Hardy. Up to 1.5m

Dierama pulcherrimum (Angel's Fishing Rod): Tall, wiry, arching stems with soft pink nodding bells. Lovely near water or over paths. To 1.5m. [Collect Only]

Digitalis purpurea 'Alba' (White foxglove): Pure white flowers on tall spires in late spring. Biennial so keep and re-sow the seed

Echinacea purpurea (Coneflower): Large rosy-purple daisy-like flowers with a large brown central cone. Very attractive to bees and butterflies. Long flowering season [Collect Only]

Echinops ritro (Globe Thistle): Blue globes held above stout grey green foliage. Attractive to bees. Likes well drained soil and plenty of sun. Hardy. Up to 1m. [Collect Only]

Epilobium angustifolium 'Album' (White Rosebay Willowherb. Syn. Chamaerion angustifolium 'Album'): Slender spires of white flowers in late summer. To 1.8m. Hardy. [Collect Only]

Eupatorium fistulosum 'Bartered Bride' (Joe Pye Weed 'Bartered Bride'): Tall, dramatic plant with large creamy white flowerheads in late summer. Good for back of borders. Attractive to bees. Hardy. Up to 2m. [Collect Only]

Eupatorium maculatum 'Gateway' (Joe Pye Weed 'Gateway'): Slightly smaller than the species but still a dramatic plant with domes of purplish pink flowers in late summer. Hardy. To 1.8m. [Collect Only]

Eupatorium maculatum 'Riesenschirm' (Joe Pye Weed 'Riesenschirm'): Even taller than the species and a dramatic plant with huge heads of purplish pink flowers in late summer. Hardy. To 2.5m. [Collect Only]

Filipendula rubra 'Venusta' (Meadowsweet 'Venusta'): Cultivated form of Meadowsweet with large heads of deep pink flowers like candyfloss.Tall plant up to 2.5m. Prefers moist but well-drained soil [Collect Only]

Fuchsia 'Riccartonii': Frost-hardy but prefers a sheltered spot. Deciduous shrub with small single, scarlet and purple flowers. Long-flowering. Up to 2.5m.

Gaura lindheimeri 'Siskiyou Pink': A lovely airy perennial with long spikes of pink flowers. Long flowering. Best in full sun, in well drained soil and a sheltered spot.

Helenium 'Sahins Early Flowerer' (Sneezeweed 'Sahins Early Flowerer'): Orange and gold streaked flowers with swept back petals and central bronze boss in late summer. To 1.4m. Hardy. [Collect Only]

Helianthus 'Lemon Queen' (Perennial sunflower): Strong and tall perennial sunflower with pale yellow flowers. Good for cut-flowers. Late summer colour. Hardy. Up to 2m.

Helianthus 'Loddon Gold' (Perennial sunflower 'Loddon Gold'): Tall, vibrant fully double, yellow flowers. Large flower heads up to 12cm width. Prefers a sunny spot. [Collect Only]

Leucanthemella serotina: Very late flowering perennial, tall white flowers with ochre centres in October. Hardy. Up to 1.4m. [Collect Only]

Miscanthus sinensis 'Ferner Osten': Clumps of narrow arching leaves and tall stems of plume-like flowers in summer. Start a rich red colour, fading to pink and grey. Hardy. Up to 1.5m. [Collect Only]

Miscanthus sinensis 'Flamingo': Clumps of narrow arching leaves and tall stems of dark pink plume-like flowers in summer. Fading to silvery grey in winter. Hardy. Up to 1.8m. [Collect Only]

Miscanthus sinensis 'Malepartus': Flowering grass with tall, pink tinged flowers in late summer into autumn. Arching dark green foliage with prominent white midrib. Height to 2m. Hardy. [Collect Only]

Miscanthus sinensis 'Morning Light': Elegant grass sporting fine green leaves with silvery-white central stripee. Flowers in late summer. Height to 1.3m. Hardy. [Collect Only]

Miscanthus sinensis 'Silberfeder': Reliable flowering grass with tall, upright silvery flowers in late summer. Arching dark green foliage. Height to 2m. Hardy. [Collect Only]

Miscanthus sinensis 'Undine': Clumps of narrow arching leaves and tall stems of plume-like flowers in summer. Fading to an oaty yellow colour in the winter. Hardy. Up to 2m. [Collect Only]

Molinia caerulea 'Heidebraut' (Purple moor grass 'Heidebraut'): Elegant flower stalks with slender purple flower heads in late summer. Makes an upright, vase shape. To 1.2m. Hardy

Molinia caerulea 'Poul Petersen' (Purple moor grass 'Poul Petersen'): Very handsome grass, much beloved by modern garden designers. Makes an upright, vase shape of burnished gold in autumn.

Petasites japonicus var. giganteus (Giant butterbur): Huge round leaves, perfect for bold foliage statement by a large pond or in damp soil. Hardy. To 1.5m. [Collect Only]

Phlomis tuberosa 'Amazone': Tall spikes bearing whorls of pink spikes in mid-summer. Hardy. To 1.5m [Collect Only]

Rudbeckia maxima (Great Coneflower): Very tall, upright Rudbeckia with large, bright yellow cones with black eyes in late summer

Salvia uliginosa (Bog Sage): Branched stems of clear blue flowers and lance-shaped leaves. Needs a sunny spot but with moist soil. Hardy. Up to 2m. AGM.

Sanguisorba 'Blackthorn' (Burnet 'Blackthorn'): Upright spikes of soft pink flowers in late summer and autumn. Hardy. 1-2-1.5m. [Collect Only]

Sanguisorba 'Cangshan Cranberry' (Burnet 'Cangshan Cranberry'): Very tall reddish stems of burgundy-red bobbly flowers in late summer over blue-green leaves. Prefers moist soil. Hardy. Up to 2m. [Collect Only]

Sanguisorba officinalis 'Crimson Queen': Tall form of Sanguisorba with airy stems and deep red-pink bobble-like flowers. Hardy. Up to 1.4m [Collect Only]

Sanguisorba officinalis 'Shiro-fukurin' (Burnet 'Shiro-fukurin'): Nicely variegated green and white leaves, maroon bobble flowers in late summer.

Sanguisorba tenuifolia 'Pink Elephant': Tall plant with arching pink bottle-brush flowers over fine, frondy foliage. To 1.5m Hardy. [Collect Only]

Sanguisorba tenuifolia var. alba: Soft arching white bottle-brush flowers over fine, frondy foliage. To 1.5m Hardy.

Stipa gigantea (Golden oats): Evergreen grass with tall stems and panicles of oat-like purple-green flowers which ripen to gold. Up to 2m. [Collect Only]

Thalictrum 'Elin' (Rue 'Elin'): Tallest of the Thalictrums we grow with huge heads of lavender and yellow flowers in mid-late summer. To 2m. Hardy. [Collect Only]

Thalictrum 'Splendide' (Rue 'Splendide'): Superb Thalictrum with clouds of purple flowers open for a very long time in late summer. Hardy. Up to 1.5m

Thalictrum aquilegiifolium (French meadow rue): Fluffy heads of pale pink or white flowers in early summer

Thalictrum aquilegiifolium 'Album' (French meadow rue 'Album'): Clouds of fluffy white flowers in spring, foliage looks like an aquilegia, but much taller. To 1.5m Hardy

Thalictrum delavayi (Chinese meadow rue): Dainty lilac-mauve flowers 2cm in width, with prominent creamy yellow stamens above fern-like bright green leaves. Hardy. Up to 1.5m.

Thalictrum delavayi 'Hinkley' (Chinese meadow rue 'Hinkley'): Dainty lilac-mauve flowers, with prominent long yellow stamens above fern-like bright green leaves. Hardy. Up to 1.5m.

Thalictrum delavayi var. acuminatum (Chinese meadow rue): Sprays of lilac flowers, soft ferny foliage. May need a little support. Lovely in dappled shade. To 1.5m.

Thalictrum rochebruneanum (Meadow rue): Airy sprays of lavender flowers with yellow stamens on tall purple-tinged stems. To 1.4m. Hardy

Verbena hastata 'Alba' (American blue vervain 'Alba'): Tall, branched stems like a candelabra with spikes of small white flowers loved by bees. Needs a sheltered spot & full sun. Up to 1.2m. [Collect Only]

Vernonia arkansana 'Mammuth' (Ironweed 'Mammuth'): Very tall with purple flowers. Good for growing amongst tall grasses and other classic prairie plants. Loved by bees. Hardy. Up to 1.8m.

Veronica longifolia (Long-leaved speedwell): Tall spires of blue flowers above long, slender foliage. To 1.5m. Hardy. [Collect Only]

Veronicastrum 'Adoration' (Culver's Root 'Adoration'): Slender spikes of lilac-pink flowers above rising whorls of slender green leaves. To 1.2m. Hardy [Collect Only]

Veronicastrum 'Red Arrows' (Culver's Root 'Red Arrows'): Reddish-pink flower spikes open to lilac, over rising whorls of pointed green leaves. To 1.4m. Hardy [Collect Only]

Veronicastrum virginicum 'Fascination' (Culver's Root 'Fascination'): One of the best cultivars with tall tapering spires of warm purple/blue flowers in mid-summer. To 1.8m. Hardy. [Collect Only]

Veronicastrum virginicum 'Lavendelturm' (Culver's Root 'Lavendelturm'): Long, narrow spires of tiny, pale lavender-blue flowers above whorls of narrow, dark green, serrated leaves. Tall to up to 2m.

Veronicastrum virginicum f. roseum 'Pink Glow' (Culver's Root 'Pink Glow'): Slender spikes of pale pink flowers above rising whorls of slender green leaves. To 1.5m. Hardy [Collect Only]