Ajuga reptans 'Black Scallop' (Bugle)

A dense, mat-forming, rapidly-spreading, evergreen to semi-evergreen perennial with ovate, glossy, wrinkled, scalloped, dark maroon leaves and spike-like whorls of deep blue flowers in late spring and early summer.

Ajuga reptans 'Braunherz' (Bugle)

A mat-forming, evergreen perennial with glossy, veined, oval to spoon-shaped, purple to bronze-green leaves and spike-like whorls of deep blue flowers in late spring and early summer. Height 20cm (8in), Spread 1m (3ft).

Ajuga reptans 'Chocolate Chip' (Bugle)

A dwarf, semi-evergeen to evergreen perennial with narrow, dark green to purple-brown foliage and blue flowers in late spring and early summer. Height 10cm (4in), Spread 50cm (1.5ft).

Armeria caespitosa (Juniper-Leaved Thrift)

An evergreen perennial with a compact, mat-forming habit. In late spring it bears pale-pink flowers above dark-green, needle-like leaves. Height 30cm (1ft), Spread 50cm (1.5ft).

Armeria maritima 'Alba' (Thrift)

A clump-forming evergreen perennial with dense, needle-like leaves and erect, stiff stems, bearing compact clusters of round-headed, white flowers in late spring and summer. Height 20cm (8in), Spread 30cm (1ft).

Armeria maritima 'Splendens' (Thrift)

A compact, dense, tufted, evergreen perennial with stiff, grass-like dark green leaves and slender, erect, stems bearing compact, ruonded clusters of reddish-pink flowers from mid-spring into summer.

Aubrieta 'Doctor Mules Variegata'

A compact, mat-forming or mound-forming, evergreen to semi-evergreen perennial bearing small, grey-green leaves with creamy-white margins and short racemes of four-petalled, violet flowers from mid-spring to early summer.

Aubrieta 'Kitte Blue'

A compact, mound-forming, evergreen perennial with mid-green leaves and blue flowers in spring. Height 10cm (4in), Spread 60cm (2ft).

Aubrieta 'Kitte Rose Red'

A compact, mat- or mound-forming, evergreen to semi-evergreen perennial with grey-green leaves and short racemes of four-petalled, magenta flowers from mid-spring to early summer. Height 20cm (8in), Spread 30cm (1ft).

Aubrieta 'Kitte White'

A compact, mound-forming, evergreen perennial with mid-green leaves and white flowers in spring. Height 10cm (4in), Spread 60cm (2ft).

Campanula carpatica 'Blue Clips' (Tussock Bellflower)

A small, spreading, mound-forming perennial with light green, heart-shaped leaves and purple-blue flowers from late spring to early autumn. Height & Spread 30cm (1ft).

Campanula portenschlagiana (Wall Bellflower)

A low mat-forming, evergreen perennial with dark-green, toothed, rounded leaves and violet-blue, bell-shaped flowers in summer. Height 20cm (8in), Spread 50cm (1.5ft).

Cerastium tomentosum (Snow-in-Summer)

A vigorous, mat-forming, deciduous perennial with linear, white-hairy, silvery grey-green leaves and, in late spring and summer, star-shaped, white flowers with notched petals. Height 10cm (4in), Spread 1.5m (5ft).

Dianthus 'Pink Kisses' (Border Carnation)

A compact, clump-forming, evergreen perennial with flat, grey-green leaves and, in summer, stiff stems bearing strongly fragrant, double, pink flowers with a prominent reddish-pink mark at the centre of each petal.

Dianthus 'Tickled Pink'

An erect, evergreen perennial with narrow, grey-green leaves and, in summer, it bears scented, double, rose-pink flowers. Height 30cm (1ft), Spread 50cm (1.5ft).

Dianthus 'Valda Wyatt' (Pink)

An evergreen perennial with an erect habit. Its narrow leaves are greyish-green. In summer it bears clove-scented, double, rose-pink flowers whose petals are dark-pink at the base. Height 30cm (1ft), Spread 50cm (1.5ft).

Erigeron 'Azure Fairy' (Fleabane)

A clump-forming perennial with lance-shaped leaves and abundant numbers of small, semi-double, yellow-centred, lavendar-blue flowers in summer. Height & Spread 50cm (1.5ft).

Erigeron 'Pink Jewel' (Fleabane)

A clump-forming perennial with lance-shaped, grey-green leaves and abundant numbers of single, yellow-centred, bright pink flowers in summer. Height 60cm (2ft), Spread 50cm (1.5ft).

Erigeron glaucus 'Sea Breeze' (Beach Aster)

A mound-forming, evergreen perennial with thick, often waxy or hairy, oval to spoon-shaped, grey-green leaves and, throughout summer, semi-double, daisy-like, lilac-pink flowers with yellow centres.

Erigeron karvinskianus (Mexican Flebane)

A mat- or mound-forming, deciduous to semi-evergreen perennial with hairy, dark green leaves and, in summer, daisy-like, white flowers turning pink to purple-pink with age. Height 30cm (1ft), Spread 1m (3ft).

Erysimum 'Bowles's Mauve' (Wallflower)

An upright, bushy evergreen perennial with narrowly lance-shaped, dark grey-green leaves and erect racemes of mauve to purple flowers from late winter into summer. Height 75cm (2.5ft), Spread 60cm (2ft).

Erysimum 'Golden Gem' (Alpine Wallflower)

A compact, bushy, semi-evergreen biennial or short-lived perennial with lance-shaped, dark green leaves and short, erect racemes of yellow flowers in spring and early summer. Height & Spread 20cm (8in).

Erysimum linifolium 'Bowles Me Away' (Wallflower)

An upright, bushy, evergreen perennial with narrowly lance-shaped, dark grey-green leaves and erect racemes of lilac purple flowers from late spring through to autumn. Height & Spread 60cm (2ft).

Fragaria vesca (Woodland Strawberry)

A woodland perennial with bright green leaves and white flowers in spring, producing red strawberries in mid-summer. Height & Spread 50cm (1.5ft).

Hutchinsia alpina (Chamois Cress)

A low-growing, mat-forming evergreen perennial with dark-green foliage. In spring, it bears clusters of lightly scented, small white flowers. Height 10cm (4in), Spread 30cm (1ft).

Iberis 'Pink Ice' (Candytuft)

A compact, mound-forming, evergreen perennial with dark green leaves and, from mid-spring to late summer, upright stems bearing dense, rounded clusters of pink flowers, darker pink at the centre of each cluster.

Lithodora diffusa 'Heavenly Blue' (Purple Gromwell)

A low-growing, mat-forming evergreen shrub, bearing small, hairy leaves and abundant, small, bright blue flowers in spring and summer. Height 10cm (4in), Spread 50cm (1.5ft).

Mesembryanthemum argenteus (Livingstone Daisy)

A low-growing, vigorous, evergreen shrub with succulent, grey-green foliage and pale salmon-pink flowers. An excellent plant for poor, dry soils. Height 30cm (1ft), Spread 60cm (2ft).

Narcissus 'Canaliculatus' (Daffodil)

A clump-forming bulbous perennial with strap-shaped leaves. In spring, it bears clusters of fragrant flowers with reflexed white petals and short dark-yellow cups. Height & Spread 20cm (8in).

Narcissus 'Jetfire' (Daffodil)

A clump-forming bulbous perennial with strap-shaped leaves. In early spring, its flowers have yellow reflexed petals and orange trumpets. Height 20cm (8in), Spread 10cm (4in).

Narcissus 'Rip van Winkle' (Double Daffodil)

A bulbous perennial with green, strap-like leaves and double, yellow-green flowers in early spring. Height & Spread 20cm (8in).

Narcissus 'Tête-à-Tête' (Daffodil)

A dwarf bulbous perennial forming a cluster of strap-shaped leaves and golden-yellow spring flowers. Height & Spread 20cm (8in).

Phlox subulata 'Candy Stripe' (Alpine Phlox)

A compact, mat-forming, evergreen perennial with linear, dark green leaves and salverform, pink- and white-striped flowers in late spring. Height 20cm (8in), Spread 50cm (1.5ft).

Phlox subulata 'Emerald Cushion' (Alpine Phlox)

A spreading, mat-forming evergreen perennial. It has bright green foliage and in late spring to early summer, is covered with lilac-pink, salver-shaped flowers. Height 20cm (8in), Spread 50cm (1.5ft).

Phlox subulata 'McDaniel's Cushion'

A compact, mat-forming, evergreen perennial with linear, dark green leaves and salver-shaped, deep pink flowers in late spring and early summer. Height 10cm (4in), Spread 50cm (1.5ft).

Primula auricula 'Black Jack' (Auricula)

A semi-evergreen, clump-forming, herbaceous perennial with powdery, pale grey leaves. It produces deep burgundy flowers with a white-rimmed yellow center from mid-spring through to summer. Height & Spread 30cm (1ft).

Primula auricula 'Lunar Eclipse' (Auricula)

A rosette-forming, evergreen perennial with powdery, fleshy, grey-green leaves and, throughout spring, fragrant, double, copper-orange flowers with yellow eyes. Height & Spread 30cm (1ft).

Primula auricula 'Purple Pip' (Auricula)

An evergreen perennial with rosettes of pale, greyish-green leaves. Clusters of deep red-purple, double flowers appear on short, upright stems in spring. Height & Spread 50cm (1.5ft).

Primula denticulata 'Blue' (Drumstick Primula)

A compact, rosette-forming, herbaceous perennial with oblong, wrinkled, grey-green leaves and sturdy, erect stems bearing dense, rounded clusters of lilac-blue to purple flowers in spring. Height & Spread 30cm (1ft).

Primula denticulata 'Ruby' (Drumstick Primula)

A herbaceous perennial with oblong, spoon-shaped green leaves, and stout stems that bare a sphere of closely packed, tiny ruby-red flowers in spring. Height & Spread 30cm (1ft).

Primula denticulata var. alba (White Drumstick Primrose)

A rosette-forming, herbaceous perennial with oblong, spoon-shaped, green leaves, and stout stems bearing dense, rounded clusters of white flowers in spring. Height 30cm (1ft), Spread 20cm (8in).

Primula veris (Cowslip)

A low growing herbaceous perennial plant forming a rosette of leaves and deep yellow flowers in the spring. Height & Spread 20cm (8in).

Rhodanthemum 'Zagora Orange' (Moroccan Daisy)

A mound-forming, woody-based, evergreen perennial with softly hairy, finely divided, grey-green leaves and erect stems bearing daisy-like, pale orange flowers from late spring to early autumn. Height & Spread 30cm (1ft).

Sedum spathulifolium 'Cape Blanco' (Stonecrop)

A mat forming, evergreen, perennial with branching, fleshy stems bearing rosettes of brittle, spoon-shaped, powder blue and copper leaves. Flat clusters of short-stemmed, star-shaped, bright yellow flowers bloom in summer.

Viola 'Rubra'

A stemless, rhizomatous, herbaceous perennial with rounded to ovate, scalloped, pointed, dark green leaves and short-stemmed, reddish-purple flowers in spring and summer. Height 20cm (8in), Spread 30cm (1ft).

Viola labradorica (Labrador Violet)

A clump- or mat-forming, semi-evergreen perennial with kidney- to heart-shaped, finely toothed, purple-flushed, dark green leaves and spurred, light purple flowers in spring and summer. Height & Spread 20cm (8in).