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 [Collect Only]

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.

Ageratina altissima 'Chocolate' (Snakeroot 'Chocolate'): An attractive perennial with leaves tinged with chocolate brown and delicate white flowers, much loved by bees and butterflies. Hardy. Up to 1m. [Collect Only]

Aruncus 'Horatio' (Goat's beard 'Horatio'): A very elegant form of the familiar goat's beard, with fine sprays of creamy flowers in summer. To 1.2m. Hardy [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.

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.

Aster novae-angliae 'Septemberrubin' (Syn. Symphyotrichum 'Septemberrubin'): Tall sprays of bright purple-red flowers with bright yellow centre in autumn. Very reliable. Great late season colour. Hardy. Up to 1.2m. [Collect Only]

Astilbe chinensis var. taquetii 'Purpurlanze': A very tall form with statuesque fluffy purple flowers above fresh green ferny foliage. Excellent for damp or shady spots. Hardy. Up to 1.2m. [Collect Only]

Calamagrostis brachytricha (Korean feather reed grass): Arching, plump spikes of silvery purplish flowerheads turning golden brown in winter. [Collect Only]

Calamagrostis x acutiflora 'Overdam' (Feather-reed grass 'Overdam'): Deciduous grass with upright clumps of narrow cream-striped leaves with stems of purplish flowers, which fade to blond through winter. Hardy. Up to 1.2m. [Collect Only]

Campanula 'Kent Belle' (Bellflower 'Kent Belle'): Tall upright stems with deep violet, narrow drooping bell shaped flowers above dark green foliage. May need some support. Hardy. To 1.2m.

Chasmanthium latifolium (Spangle grass): Deciduous perennial grass, with arching stems of flattened spikes. Bronze tints in Autumn. Moist, well-drained soil. Hardy. Up to 1m.

Clematis integrifolia: Non-climbing form of Clematis with small blue bell shaped flowers. Flowers on current seasons wood in late summer. Hardy. Up to 1m. [Collect Only]

Crocosmia 'Paul's Best Yellow': Arching sprays of golden yellow flowers in late summer. A vigorous grower. Fully hardy in well drained soils. To 1m

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

Dryopteris affinis 'Cristata The King': Tall, semi-evergreen fern with arching fronds,each leaflet is divided (Crested). Best in moist semi-shade. Hardy. Up to 1.2m.

Dryopteris filix-mas (male fern): The native deciduous fern with tall fronds in a shuttlecock shape. Leaves turn copper brown in the autumn. Prefers moist shade. 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. [Collect Only]

Echinops ritro 'Veitch's Blue' (Globe thistle): Dark blue spherical flower heads above attractive grey-green foliage. Loved by bees and butterflies. Hardy. Up to 1m [Collect Only]

Euphorbia characias (Spurge): Evergreen perennial with blue-green leaves and lime-green flowers in early summer. Long-flowering. May self-seed. Prefers a sunny spot. [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.

Euphorbia palustris 'Walenburg's Glorie' (Marsh spurge 'Walenburg's Glorie'): Bright acid green bracts in spring, creating vibrant clumps of flowers. A warmer yellow than the species. Good on moist soils. Hardy. Up to 1m.

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

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. Hardy. Up to 1m.

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.

Hemerocallis 'Stafford' (Day lily 'Stafford'): Large, velvety red flowers with a gold throat in mid-late summer. Height to 70cm. Hardy.

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.

Hemerocallis lilioasphodelus (yellow daylily): Fragrant lemon yellow lily flowers above green strappy foliage. Semi-evergreen. Flowers typically open in the evening. Hardy. Up to 1m.

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

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.

Leucanthemum x superbum 'Sonnenschein' (Shasta daisy 'Sonnenschein'): Shasta daisy with pale yellow flowers with golden centre. Excellent for cutting. Long flowering season. Hardy. Up to 90cm

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.

Lobelia x speciosa 'Vedrariensis': Dramatic spikes of royal purple flowers in late summer. Needs damp soil in summer so is ideal for bog gardens. Height to 1.2m. Hardy

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

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

Lythrum salicaria 'Feuerkerze' (Loosestrife 'Firecandle'): Tapering, sturdy spikes of bright pink flowers in mid to late summer. To 1.2m. Hardy

Lythrum salicaria 'Swirl' (Loosestrife 'Swirl'): Slender upright spires of bright pink flowers from early to late summer. Does well in damp borders but generally unfussy. Hardy. Up to 1m. [Collect Only]

Molinia caerulea 'Transparent' (Purple moor grass 'Transparent'): Deciduous grass with long feathery purple flower spikes. Likes moist but well-drained soil in sun or light shade. Hardy. Up to 1.2m.

Muhlenbergia capillaris (Pink muhly grass): Clump-forming grass with dramatic billowing pink flowers in summer into autumn. Semi-evergreen. Hardy. Up to 1m.

Panicum virgatum 'Shenandoah' (Switch grass 'Shenandoah'): Deciduous clump-forming grass with strappy green leaves turning purple/red in autumn, airy panicles of flowers flushed purple. Hardy. Up to 1.1m. [Collect Only]

Panicum virgatum 'Squaw' (Switch grass 'Squaw'): Deciduous grass with strappy green leaves which turn a purple red in autumn, with airy panicles of flowers flushed pink. Hardy. Up to 1m.

Phlox paniculata 'Norah Leigh': A bold variegated phlox with pale pink almost white flowers with dark pink eye. Lovely fragrance. Hardy. Up to 1m.

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.

Sanguisorba officinalis 'Red Thunder' (Burnet 'Red Thunder'): Stems of dark-red bobble-like flowers above attractive divided foliage. Up to 1.2m. [Collect Only]

Stipa calamagrostis (Pheasant grass): Deciduous grass with narrow arching leaves and attractive feather-like flowers in summer. Can cope with dry soil. Hardy. Up to 1m.