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. [Collect Only]

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]

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

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 '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

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]

Eryngium agavifolium (Agave-leaved sea holly): A statement foliage plant with an agave-like rosette from which arises tall spikes with cone-like grey-green flowers. Loved by bees. Hardy. Up to 1.5m. [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]

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

Nepeta parnassica (Catmint): Very tall catmint with stout stems up to 1.8m and aromatic blue flowers

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. [Collect Only]

Peucedanum verticillare (Giant Hog Fennel): Huge and stately umbellifer with unfolding pinkish stems ultimately opening to a flat, open head of tiny greenish-white flowers

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 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. [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.

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.

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.

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 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]