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.

Agastache rugosa f.albiflora 'Liquorice White' (Korean mint 'Liquorice White'): Tall, aromatic perennial with spires of tiny white flowers. Aromatic foliage. To 1.5m. Fully hardy in light soils. May self-seed.

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

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. [Collect Only]

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. [Collect Only]

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.

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 [Collect Only]

Crocosmia 'Lucifer': Swathes of brilliant scarlet flowers over bold strappy green foliage. Easy and trouble free as long as soil is not too wet. To 1.2m. Hardy. [Collect Only]

Cynara cardunculus (Cardoon): Dramatic, tall silver leaved plant topped with large purple thistle flowers in mid-summer. Hardy. Up to 2.5m. [Collect Only]

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

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. Attractive to bees. Likes well drained soil and plenty of sun. Hardy. Up to 1m. [Collect Only]

Eryngium ebracteatum var. poterioides: Tall and evergreen with attractive blue-green foliage and wiry stems of red-brown bobble-like flowers, Sanguisorba-like. Hardy. Up to 1.5m. [Collect Only]

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. [Collect Only]

Helianthus 'Capenoch Star' (Perennial sunflower 'Capenoch Star'): A superb form of perennial sunflower with tall stems of cheery yellow flowers with pompom-like centres. Hardy. Up to 1.5m.

Perovskia 'Filigran' (Russian Sage 'Filigran'): 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. Hardy. To 1.5m [Collect Only]

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

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

Selinum wallichianum (Wallich milk parsley): Stately umbellifer with large white heads atop large lacy leaves. Hardy. To 1.5m [Collect Only]

Thalictrum 'Anne' (PBR) (Rue 'Anne'): Tall, stately plant with a froth of pinkish-white flowers in mid-summer. To 2m. Hardy [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 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 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 delavayi var. decorum (Chinese meadow rue): Sprays of small hanging pinkish purple flowers above soft filigree foliage

Thalictrum delavayi var. mucronatum (Chinese meadow rue): Sprays of small hanging pinkish purple flowers above soft filigree foliage. To 1.5m. Hardy.

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

Verbena bonariensis: Tall, airy but strong slender stems with flat heads of purple flowers in mid to late summer. To 1.8m. Frost-hardy. [Collect Only]

Verbena hastata 'Rosea' (American blue vervain '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. 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 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]