Acanthus hungaricus (Long-leaved bear's breeches): Architectural spires of purple/white flowers over large, dark green deeply divided leaves. Best in sun or light shade. Height to 1.2m

Acanthus mollis (Bear's Breeches): Architectural spires of purple/white flowers over large, dark green deeply divided leaves. Best in sun or light shade. Height to 1.2m.

Acanthus mollis (Latifolius Group) 'Rue Ledan (Bear's Breeches 'Rue Ledan'): Architectural spikes of hooded pure white spiny flowers over large, soft, bright green leaves. Best in sun or part shade. Height to 1.2m

Achillea filipendulina 'Gold Plate' (Yarrow 'Gold Plate'): Statuesque achillea with huge, flat gold flower heads above upright ferny foliage. A statement plant for dry, sunny borders. Hardy. To 1m. [Collect Only]

Actaea pachypoda (white baneberry): Grown mainly for its pure white berries in autumn, each with a black 'eye' on a red stalk. Hardy. Up to 1m. [Collect Only]

Actaea simplex 'Pink Spike' (Baneberry 'Pink Spike' (Previously known as Cimicifuga)): Spires of scented pale pink flowers from pink buds in late summer. Reddish-brown foliage. [Collect Only]

Agastache 'Blackadder' (Giant hyssop 'Blackadder'): Bright blue flower spikes and aromatic foliage - very attractive to bees. To 1.2m. Hardy [Collect Only]

Anemone x hybrida 'Honorine Jobert' (Japanese Anemone 'Honorine Jobert'): Large white flowers flowering from late summer to autumn. Good in almost any soil, except wet. Fully hardy. To 1.2m

Aruncus dioicus (Goat's beard): Stately plant for larger borders or feature plant. Deeply divided foliage, frothy panicles of creamy white flowers in summer. Hardy. Up to 2m. [Collect Only]

Aster 'Little Carlow' (Syn. Symphyotrichum 'Little Carlow' (cordifolium hybrid)): Large sprays of small purplish blue flowers in autumn. Very reliable, easy to grow perennial. Hardy. Up to 1m. [Collect Only]

Aster macrophyllus 'Twilight' (Syn. Eurybia x herveyi): Lavender-blue flowers with a yellow centre in late summer. Mildew-resistant foliage. An earlier flowering variety. Height to 1m.

Astrantia maxima (Largest masterwort): Two-tone pink/green, long-lasting, starry flowers. Best in a bit of shade and moist soil. Hardy. Up to 60cm.

Baptisia 'Indigo Spires' (Indigo weed 'Indigo Spires'): Spikes of violet-blue pea-like flowers with a yellow edge above a mound of grey-green foliage. Long flowering. Hardy. Up to 1.2m [Collect Only]

Baptisia australis (Indigo weed): Spires of lipped indigo flowers over olive-green foliage. Flowering height 1.2m.

Campanula persicifolia (Peach-leaved bellflower): Tall spikes of large, cup-shaped blue flowers over slender foliage in mid-summer. To 1.2m. Hardy [Collect Only]

Centaurea atropurpurea: Attractive deep-red, almost black thistle like flowers above silvery foliage. Good for bees and butterflies. Hardy. Up to 1m. [Collect Only]

Dierama igneum (Angel's Fishing Rod): Dainty soft red flowers on arching stems. A short form reaching no more than 60cm [Collect Only]

Digitalis grandiflora (Yellow foxglove): Perennial foxglove with yellow bell-shaped flowers above clumps of evergreen lance-shaped leaves. Bee-friendly. Hardy. Up to 1m. AGM

Echinacea 'Green Envy' (PBR) (Coneflower 'Green Envy'): Green flowers with a slight pink tinge to petal tips and pink cone. To 1.2m. [Collect Only]

Echinacea purpurea 'Magnus Superior' (Coneflower 'Magnus Superior'): Superb form with tall stems of pink daisy flowers with a central brown cone. Prefers full sun and good drainage. Hardy. Up to 1m.

Echinops bannaticus 'Blue Globe' (Globe thistle): Tall upright stems of bright blue globe flowers above clumps of spiny, grey-green leaves. Bee-friendly. Hardy. Up to 1.2m.

Echinops sphaerocephalus 'Arctic Glow' (Globe thistle 'Arctic Glow'): Tall upright stems of white globe flowers above clumps of spiny, grey-green leaves. Bee-friendly. Hardy. Up to 1m.

Epilobium angustifolium 'Stahl Rose' (Rosebay Willowherb. Syn. Chamaerion angustifolium 'Stahl Rose''): Slender spires of pale pink flowers in late summer. Spreads rapidly through underground runners. To 1m. Hardy. [Collect Only]

Euphorbia characias Silver Swan = 'Wilcott' (PBR) (Spurge 'Silver Swan'): A striking, variegated form with blue-green leaves edged in white. Green and white flowering bracts in late Spring.

Geranium 'Ann Folkard' (Cranesbill 'Ann Folkhard'): Magenta flowers with black eye on long trailing stems. Yellowish green leaves. To 1.2m. Hardy

Geranium psilostemon (Armenian cranesbill): Big magenta flowers with shiny black eye. Tall and vigorous. To 1.2m. Hardy.

Helenium 'Kanaria' (Sneezeweed 'Kanaria'): Masses of clear lemon yellow flowers with swept back petals and central mustardy-gold dome. [Collect Only]

Helenium 'Mardi Gras' (Sneezeweed 'Mardi Gras'): Bright orange petals, splashed with yellow and brown central cone in late summer. Long flowering if cut back flowered stems. [Collect Only]

Helenium 'Moerheim Beauty' (Sneezeweed 'Moerheim Beauty'): Brilliant coppery-red flowers with swept back petals and a central chocolate boss in late summer. To 1.2m. [Collect Only]

Hemerocallis citrina (Long yellow day lily): Fragrant lemon, yellow lily flowers on long stems above green strappy foliage. Flowers open in evening. Hardy. Up to 1.2m.

Iris sibirica 'Gull's Wing' (Siberian Iris 'Gull's Wing'): Pure white flowers with a greeny yellow throat, over strappy green foliage. Prefers moist soil. Makes a bold clump. Hardy. Up to 1m. [Collect Only]

Iris sibirica 'Silver Edge' (Siberian Iris 'Silver Edge'): Rich purple flowers with a fine silver picotee petal edge. [Collect Only]

Kniphofia 'Alcazar' (Red hot poker 'Alcazar'): Tall spikes of vibrant red-orange flowers opening to a paler yellow to give a two-tone effect. Strappy green foliage. Hardy. Up to 1.2m. [Collect Only]

Kniphofia 'Bees Sunset' (Red hot poker 'Bees Sunset. Syn. Kniphofia 'Shining Sceptre')): Sturdy golden spikes over strappy green foliage in late summer.

Leucanthemum x superbum 'Becky' (Shasta daisy 'Becky'): Shasta daisy with clean white flowers with golden centre. Long flowering season. Ideal for sunny border. Hardy. Up to 1m. [Collect Only]

Ligularia dentata 'Desdemona' (Leopard plant 'Desdemona'): Large orange daisy-like flowers over rounded greeny-bronze foliage with purple undersides. To 1m. Hardy. [Collect Only]

Lobelia x speciosa 'Tania': Dramatic spikes of brightest pink flowers in late summer.

Lupinus 'Chandelier' (Lupin 'Chandelier' (Band of Nobles Series)): Tightly packed spires of creamy yellow flowers in midsummer. Long flowering. Hardy. Up to 1m. [Collect Only]

Lupinus 'The Page' (Lupin 'The Page' (Band of Nobles Series)): Tall spires of bright red flowers in midsummer. Cottage garden favourite. Hardy. Up to 1m. [Collect Only]

Lychnis chalcedonica (Maltese cross): Domes of bright scarlet flowers with four petals, hence its common name. Excellent for adding height and bright colour in summer borders [Collect Only]

Lychnis coronaria Atrosanguinea Group (Rose campion (dark red)): Bright magenta flowers over felty, silver foliage. Great for sunny, dry areas can be short lived in a wet, cold winter. To 1.2m Hardy.

Lysimachia clethroides (Gooseneck Loosestrife): Spikes of white flowers arch over and tip up again, like a goose or swan neck. To 1m. Hardy

Lythrum salicaria 'Blush' (Loosestrife 'Blush'): Tapering, sturdy spikes of soft pink flowers in mid to late summer. To 1.2m. Hardy [Collect Only]

Lythrum virgatum 'Dropmore Purple' (Wand loosestrife 'Dropmore Purple'): Upright spikes of purple-pink flowers in the mid-summer with lance-like foliage. Prefers a moist soil. Hardy. Up to 1m.

Morina longifolia: Whorls of white tubular flowers which age to pink, above prickly rosettes of glossy dark green aromatic leaves. Hardy. Up to 90cm.

Paeonia lactiflora 'White Wings' (Peony 'White Wings'): Single, lightly fragrant white flowers with gold centre. Full sun or light shade, rich but open soil best. To 1m. Fully hardy. [Collect Only]

Paeonia wittmanniana: A delightful herbaceous peony with pale pink almost white bowl-shaped flowers with a yellow centre and attractive foliage. Hardy. Up to 1m. [Collect Only]

Persicaria amplexicaulis 'Alba' (white flowered red bistort): Spikes of white flowers in late summer. Large oval pointed leaves. Hardy. Up to 1.2m.

Phlox paniculata 'David' (Phlox 'David'): An excellent phlox with clean white flowers and a delightful scent. To 1.2m. Hardy. [Collect Only]

Phlox paniculata 'Miss Pepper': Tall phlox variety with dark stems and pink flowers with a deep pink eye. Lovely fragrance. Hardy. Up to 1m. [Collect Only]

Physostegia virginiana (Obedient plant): Spires of light pinkish purple flowers on slowly spiralling stems. [Collect Only]

Polygonatum verticillatum 'Rubrum': Tall upright dark-red stems with whorls of narrow leaves and bell shaped flowers flushed red. Good in shade. Hardy. Up to 1m. [Collect Only]

Sanguisorba 'Chocolate Tip': Spikes of burgundy-red bobble-like flowers appear in late summer over green leaves tinged with brown. Hardy. Up to 1m. [Collect Only]

Sanguisorba 'Pink Tanna' (Burnet 'Pink Tanna'): Fluffy Pink flower bobbles mid-late summer over attractive fern-like foliage. Good in damp soil, sun or shade. Hardy. Up to 1m.

Thalictrum delavayi 'Album' (Chinese meadow rue 'Album'): Dainty cup-shaped white flowers held high above fern-like greyish green leaves. To 1.2m. Hardy [Collect Only]

Thalictrum delavayi 'Hewitt's Double' (Chinese meadow rue 'Hewitt's Double'): Tiny purple pom-pom flowers dance airily above ferny grey-green foliage. Height to 1.2m. Hardy