Achillea chrysocoma 'Grandiflora': A real statuesque perennial with tall stems of huge creamy white flowers. Finely divided leaves. Prefers a sunny spot. Hardy. Up to 1.8m. [Collect Only]

Agastache rugosa f.albiflora 'Liquorice White' (Hyssop): Tall, aromatic perennial with spires of tiny white flowers. [Collect Only]

Angelica gigas: Magnificent plant with huge domes of purple flowers in mid summer, turning to attractive seed heads

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

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

Centaurea macrocephala (Giant knapweed): Huge, bright yellow almost fluffy flowers in mid-summer. [Collect Only]

Cephalaria gigantea (Giant scabious): Very tall wavy stems topped with large lemon yellow scabious-like flowerss

Cirsium rivulare 'Atropurpureum' (Brook thistle): Deep red thistle flowers held above typical thistley foliage.

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

Cirsium rivule 'Trevor's Blue Wonder (Brook thistle): Not blue at all, I'm afraid, but a more purplish hued form of the more familiar deepest pink Cirsium rivulare 'Atropurpureum' [Collect Only]

Crocosmia 'Lucifer': Swathes of brilliant scarlet flowers over bold strappy green foliage [Collect Only]

Cynara cardunculus (Cardoon): Dramatic, tall silver leaved plant topped with large purple thistle flowers in mid-summer. [Collect Only]

Dierama pulcherrimum (Angel's Fishing Rod): Tall, wiry, arching stems with soft pink nodding bells. Lovely near water or over paths

Echinops bannaticus 'Taplow Blue' (Globe thistle): Tall stems of pale blue globe flowers, clumps of spiny, grey-green leaves with silver undersides. Bee-friendly. Hardy. Up to 1.5m. [Collect Only]

Echinops ritro (Globe Thistle): Blue globes held above stout grey green foliage. [Collect Only]

Gaura '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. [Collect Only]

Helianthus 'Capenoch Star': A superb form of perennial sunflower with tall stems of cheery yellow flowers with pompom-like centres. Hardy. Up to 1.5m. AGM. [Collect Only]

Perovskia 'Filigran' (Russian Sage): Silvery foliage & spikes of purple flowers in mid-summer. More upright than other cultivars. Lovely winter stem effect. Hardy. Up to 1.5m.

Phlomis tuberosa 'Amazone': Tall spikes bearing whorls of pink spikes in mid-summer [Collect Only]

Rheum palmatum 'Atrosanguineum' (Ornamental rhubarb): Very large, deeply dissected green leaves with plum-coloured undersides. Sprays of rich pink flowers in summer. [Collect Only]

Sanguisorba tenuifolia 'Alba': Soft arching white bottle-brush flowers over fine, frondy foliage.

Selinum wallichianum (Wallich milk parsley): Stately umbellifer with large white heads atop large lacy leaves [Collect Only]

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 'Anne' (Meadow rue 'Anne'): Tall, stately plant with a froth of pinkish-white flowers in mid-summer [Collect Only]

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

Thalictrum delavayi AGM: Dainty lilac-mauve flowers 2cm in width, with prominent creamy yellow stamens above fern-like bright green leaves.

Thalictrum delavayi f. acuminatum (Meadow rue, Lavender meadow rue): Sprays of lilac flowers, soft ferny foliage.

Thalictrum delavayi var. decorum (Meadow rue): Sprays of small hanging pinkish purple flowers above soft filigree foliage

Thalictrum delavayi var. mucronatum (Meadow rue): Sprays of small hanging pinkish purple flowers above soft filigree foliage

Thalictrum rochebrunianum (Meadow rue, Lavender meadow rue): Airy sprays of lavender flowers with yellow stamens on tall purple-tinged stems

Verbena bonariensis (Verbena): Tall, airy but strong slender stems with flat heads of purple flowers in mid to late summer. [Collect Only]

Verbena hastata 'Rosea': Tall, branched stems like a candelabra with spikes of small pink flowers loved by bees. Needs a sheltered spot in full sun. Up to 1.2m. [Collect Only]

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

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

Veronicastrum virginicum 'Album' (Culver's Root): Slender spikes of white flowers above rising whorls of slender green leaves. [Collect Only]

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