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 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]

Asphodeline lutea (Asphodel): Vertical spikes of sulphur yellow flowers in early to mid-summer. Hardy, but dislikes heavy soil in winter. To 1.2m [Collect Only]

Briza media (Lesser quaking grass): Semi-evergreen grass with beautiful delicate dangling flower heads. Short lived perennial but it will self-seed around. Up to 70cm.

Campanula punctata 'Wedding Bells' (Bellflower 'Wedding Bells'): White hose-in-hose or semi-double bell-like flowers, infused with pink. Flower throughout the summer. Hardy. Up to 60cm.

Centaurea 'Silver Feather' PBR: A choice perennial with fluffy lilac-pink flowers over beautiful silver finely divided foliage. Evergreen. Full sun and good drainage. To 40cm. Hardy. [Collect Only]

Centaurea montana (Perennial cornflower): Large blue flowers in early summer, repeated later in year if cut back. Very attractive to bees. To 50cm. Hardy

Centaurea montana 'Grandiflora' (Perennial cornflower 'Grandiflora'): Larger blue flowers than the species, with darker purple heart in early summer, cut back for repeat flowering. Very attractive to bees. To 50cm. Hardy

Euphorbia characias subsp. wulfenii (Mediterranean spurge): Evergreen perennial with blue-green leaves and vibrant lime-green flowers in early summer. Prefers full sun. Hardy to about -10C, but not for long periods. Up to 1.2m. [Collect Only]

Festuca amethystina: Evergreen grass with elegant, dusky purple arching flower stalks very early in season, for a grass.To 50cm.

Filipendula 'Red Umbrellas' (Meadowsweet 'Red Umbrellas'): Green leaves, deeply veined with crimson, with clouds of fluffy pink flowers. Compact variety. Prefers a moist soil. Hardy. Up to 70cm.

Francoa sonchifolia (Bridal wreath): Spires of pale pink flowers over semi-evergreen, pinkish-green foliage.

Geranium 'Ivan' (Cranesbill 'Ivan'): Vibrant magenta-pink flowers with a dark black centre above yellow green leaves. Leaves turn red in autumn. Hardy. Up to 50cm.

Geranium 'Orion' (Cranesbill 'Orion'): A dome of deeply divided foliage, smothered in large blue flowers from early summer onwards [Collect Only]

Geranium himalayense 'Derrick Cook' (Cranesbill 'Derrick Cook'): Large white flowers with delicate purple veining above a clump of bright green leaves. Foliage turns red in autumn. To 35cm. Hardy.

Geranium macrorrhizum 'Bevan's Variety' (Cranesbill 'Bevan's Variety'): Superb ground cover Geranium especially for dry shade. Bright pink over a dense mound of aromatic foliage. Hardy. To 30cm.

Geranium nodosum (Knotted cranesbill): Fast spreading hardy geranium with purplish pink flowers over a long season in summer. A great gap filler. Up to 50cm.

Geranium sylvaticum 'Album' (Wood cranesbill): Upright stems of white saucer-shaped flowers above deeply divided leaves. Prefers moist shadier spots. Hardy. Up to 70cm.

Geum 'Bell Bank' (Avens 'Bell Bank'): Large coral pink flowers over a rosette of crinkled leaves.To 40cm. Hardy.

Geum 'Borisii': A shorter form with vivid orange-red flowers on upright stems and semi-evergreen foliage. Vigorous and good for front of border. Hardy. Up to 30cm.

Geum 'Georgenberg' (Avens 'Georgenburg'): Gold flowers held atop reddish stems in early to mid-summer. To 30cm. Hardy

Geum 'Mai Tai' (PBR) (Avens 'Mai Tai'): Semi-double, pale apricot flowers above green foliage. Long-flowering. Hardy. Up to 45cm.

Geum 'Prinses Juliana' (Avens 'Prinses Juliana'): Bright orange flowers held on tall stems above mounds of rounded foliage. Flowers for ages and reflowers when cut back.

Geum 'Rijnstroom': A bright orange semi-double flower in late spring. Prefers a moist soil and sunny spot but can tolerate light shade. Hardy. Up to 50cm.

Geum 'Rusty Young' (Avens 'Rusty Young'): Warm golden yellow flowers splashed with coppery red.

Geum 'Savannah Sunset' (Avens 'Savannah Sunset'): Apricot, semi-double flowers with red buds held on red stems above rosettes of rounded hairy leaves. Long flowering. Hardy. Up to 35cm.

Geum 'Stacey's Sunrise' (Avens 'Stacey's Sunrise'): Pale yellow flowers on compact stems above rosettes of rounded hairy leaves. Semi-evergreen. Long flowering. Hardy. Up to 30cm.

Geum 'Totally Tangerine' (PBR) (Avens 'Totally Tangerine'): Lovely single-flowered bright orange flowers held on erect stems above mounds of green foliage. Hardy. Up to 60cm.

Geum 'Werner Arends' (Avens 'Werner Arends'): An old cultivar which stays compact. A bright clean orange flower on an upright stem above a rosette of crinkly leaves. Hardy. Up to 35cm.

Geum rivale 'Leonards Variety' (Avens 'Leonards Variety'): Coppery- rose flowers held above rosettes of rounded, softly hairy foliage. To 40cm. Hardy

Geum Scarlet Tempest = 'Macgeu001' (PBR) (Avens 'Scarlet Tempest'): Scarlet, semi-double flowers held on tall stems above rosettes of rounded hairy leaves. Long flowering. Hardy. Up to 50cm.

Hemerocallis 'Stella de Oro' (Day Lily 'Stella de Oro'): Pale yellow fragrant flowers with a darker yellow throat. Grass-like green foliage. Hardy. Up to 50cm.

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.

Heuchera 'Paris': Green leaves, attractive silver markings and coral red flower spikes in mid summer. All-round attractive plant

Iris 'Langport Wren': Sword-shaped glaucous green leaves and stems of up to 4 flowers, with rich reddish-purple and deep maroon almost brown flowers. [Collect Only]

Lamium orvala: A woodland perennial with large, crushed strawberry colour, lipped flowers in early summer. Hardy. Up to 50cm.

Lychnis flos-cuculi 'White Robin' (White Ragged Robin): A pretty white form of our native Ragged Robin. Starry white flowers in early summer. Thrives in damp, part-shaded spots.

Nepeta 'Six Hills Giant' (Catmint 'Six Hills Giant'): A vigorous sun lover which will soon make a generous clump. Spikes of tiny purple flowers over aromatic grey/green foliage.

Nepeta racemosa 'Walker's Low' (Catmint 'Walker's Low'): Forms neat mounds of silvery green foliage, topped with masses of lavender blue flowers in early summer. Up to 60cm. Hardy.

Nepeta x faasenii (Catmint): A compact variety of catmint with mounds of aromatic silvery green foliage and lavender blue flowers.Hardy. Up to 45cm.

Origanum vulgare 'Country Cream' (Oregano 'Country Cream'): Lovely variegated oregano, with clusters of pretty pink flowers in summer. Perfect for edging paths, gravel gardens and pots. Height up to 30cm.

Persicaria bistorta 'Superba' (Bistort 'Superba'. Syn. Polygonum bistorta 'Superbum'): Upright fluffy pink spikes make a bold show in early summer. Great for filling larger spaces. Hardy. Up to 60cm.

Polemonium 'Heaven Scent' (PBR) (Jacob's Ladder Heaven Scent'): Lovely dark, purple foliage and stems in spring which contrasts well with the pale lilac purple bell like flowers. Lightly scented. Hardy. Up to 50cm.

Primula vialii (Vial's Primrose): Flower spikes of crimson buds open into a mass of pale purple flowers in mid-summer. Often reflowers in late summer/autumn

Primula vialii 'Alison Holland' (Vial's Primrose 'Alison Holland'): A white form of P.viallii with poker-like white flowers. Likes damp soil in summer but must be free-draining in winter. Hardy. To 30cm.

Salvia 'Serenade' (Balkan Clary 'Serenade'): Dark stemmed flower spikes with lighter purple flowers above sage-like grey-green leaves. Prefers a sunny spot. Hardy. Up to 70cm. [Collect Only]

Salvia nemorosa 'Caradonna' (Balkan Clary 'Caradonna'): Rich purple spikes in early summer - just in time for Chelsea Flower Show at which is widely used.To 50cm. Hardy

Sanguisorba obtusa 'Alba' (Japanese burnet - white): A lovely white form of Sanguisorba obtusa with softly hanging white bottle brushes

Saxifraga x urbium (London Pride): Wiry stems topped with dainty pale pink flowers over ground evergreen rosettes of green leaves with creamy yellow markings.

Sedum spathulifolium 'Purpureum' (Purple stonecrop): Mat forming, fleshy purple rosettes with an attractive grey cast when young. Yellow flowers in summer.

Tellima grandiflora 'Forest Frost' (Fringecups): Slender spikes of pinkish flowers late spring to mid-summer. Semi-evergreen reddish foliage. Great in shade. Height to 30cm. Hardy

Thalictrum aquilegiifolium (French meadow rue): Fluffy heads of pale pink or white flowers in early summer. Adds valuable height to shady borders. To 1.4m. Hardy.

Veronica austriaca 'Crater Lake Blue' (Speedwell 'Crater Lake Blue'): Vivid blue spikes above a mound of green foliage.To 30cm. Hardy.