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 'Avalanche' (Feather-reed grass 'Avalanche'): Deciduous grass that forms upright clumps of narrow leaves with green margin and white stripe with stems of purplish flowers. Hardy. Up to 1.5m.

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 (Milky bellflower): Clusters of blue flowers on tall stems in mid-summer. Ideal for filling out borders and adding height. Fills out quite quickly too. To 1.5m. Hardy. [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.

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

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.

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

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]

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. [Collect Only]

Leucanthemum x superbum 'Wirral Supreme': Tall form of Shasta daisy with white flowers and multiple shorter petals around the golden centre, making an attractive frilly effect. Hardy. Up to 1.5m. [Collect Only]

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

Romneya coulteri (Californian tree poppy.): Tall, impressive plant with large, crepe-paper white flowers with central yellow 'boss'.

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 'Purpurea': Tall dark-red purple bottle-brush flowers over fine, frondy foliage. Likes sun or dappled shade, not too dry. 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]

Sanguisorba tenuifolia var. alba 'Korean Snow': A very tall form with white fluffy tassel-like flowers above attractive ferny green foliage. Prefers full sun, will tolerate some shade. Hardy. Up to 1.8m. [Collect Only]

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

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

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

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.

Veronicastrum virginicum 'Album' (Culver's Root 'Album'): Slender spikes of white flowers above rising whorls of slender green leaves. To 1.5m. 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]