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]

Aconitum napellus (Monkshood): Dark blue hooded flowers over finely divided foliage. This Aconitum flowers early, in late spring/early summer. Height to 1.5m. Hardy. [Collect Only]

Actaea matsumurae 'White Pearl' (Baneberry 'White Pearl' (Previously known as Cimicifuga)): Ferny, light green foliage all summer, arching spires of scented white flowers in autumn. Great in some shade. Hardy. Up to 1.5m [Collect Only]

Actaea simplex 'Brunette' (Baneberry 'Brunette' (Previously known as Cimicifuga)): Spires of scented white flowers in late summer over very attractive ferny dark foliage. A superb plant in part shade. Hardy. Up to 1.5m

Actaea simplex 'Hillside Black Beauty' (Baneberry 'Hillside Black Beauty' (Previously known as Cimicifu): Spires of scented pale pink flowers in late summer over very attractive ferny dark foliage. A great statement plant for part shade. Hardy. Up to 1.5m [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.

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 '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.

Cichorium intybus (Wild chicory): Beautiful cornflower-blue flowers held on tall stems in late summer. May need 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]

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

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]

Eupatorium maculatum 'Red Dwarf' (Joe Pye-weed 'Red Dwarf'): A shorter form of the more common variety, with domes of purplish red flowers in late summer. To 2m. Hardy

Fagopyrum dibotrys: Tall statement plant for the back of a border. Airy white flowers in late summer. Heart-shaped leaves. Stems red in autumn. Vigorous. Hardy. Up to 1.5m.

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]

Foeniculum vulgare 'Purpureum' (Bronze fennel): Finely divided, aniseed scented, bronze-purple foliage, followed by tall yellow umbel flower heads. Attractive to bees. Hardy. Up to 1.8m.

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]

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. [Collect Only]

Helianthus 'Monarch': A perennial sunflower with tall, semi-double bright yellow flowers. Prefers a sunny spot. Flowering late summer. Hardy. Up to 2.5m.

Helianthus salicifolius (Willow-leaved sunflower): Tall, mobile stems with fine, willow-like leaves - makes a fine foliage feature. Yellow flowers in autumn [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]

Ligularia przewalskii: Elegant spikes of golden yellow flowers on black stems above very deeply divided green foliage. [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. [Collect Only]

Osmunda regalis (Royal Fern): Majestic deciduous fern growing up to 2.5m with impressive fronds which change to red-brown in autumn. Prefers a moist soil. Hardy.

Panicum virgatum 'Heavy Metal' (Switch grass 'Heavy Metal'): Deciduous clump-forming grass with strappy blue-green leaves which turn a to purple/red, with clouds of airy flowers flushed purple. Hardy. Up to 1.5m

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'.

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 canadensis (White burnet): Bottle-brush white flowers in late-summer above green pinnate foliage. Very tactile plant. Long flowering. Hardy. Up to 2m

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.

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

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 'Apollo' (Culver's Root 'Apollo'): Very long, narrow spires of pale purple blue flowers above whorls of narrow, dark green, serrated leaves. To 1.5m. 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. [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]