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).

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 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).

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 carpatica 'Pearl Dark Blue' (Tussock Bellflower)

A compact, mound-forming, deciduous perennial with heart-shaped, toothed, dark green leaves and upturned, open bell-shaped, dark violet-blue flowers from late spring to early autumn. Height 30cm (1ft), Spread 50cm (1.5ft).

Campanula carpatica 'Pearl White' (Tussock Bellflower)

A compact, mound-forming, deciduous perennial with lance-shaped, toothed, dark green leaves and outward facing, bell-shaped, single, white flowers from late spring to early autumn. Height & 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 'Flutterby'

A compact evergreen perennial with grey-green leaves and, in summer, scented, single flowers which are magenta-pink with a thin white margin. Height & Spread 50cm (1.5ft).

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).

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).

Helianthemum 'Cerise Queen' (Rock Rose)

A mat-forming, evergreen shrub with small green leaves and masses of double pink flowers with yellow centres from late spring to early summer. Height 30cm (1ft), Spread 60cm (2ft).

Helianthemum 'The Bride' (Rock Rose)

A compact, spreading evergreen shrub with narrow, grey leaves and single, cream flowers with a yellow center. Height & Spread 50cm (1.5ft).

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).

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).

Primula vulgaris (Primrose)

A perennial forming clusters of rounded mid-green leaves and pale yellow flowers in early spring. Height 20cm (8in), Spread 30cm (1ft).

Rhodanthemum 'Casablanca' (Moroccan Daisy)

A mound-forming, woody-based, evergreen perennial with softly hairy, finely divided, grey-green leaves and, from early spring into autumn, erect stems bearing white, daisy-like flowers with orange-brown central discs.

Rhodanthemum 'Marrakech' (Moroccan Daisy)

A low-growing, spreading, woody-based, evergreen perennial with softly hairy, finely divided, silvery leaves and, from early spring to early autumn, pale pink to deep pink, daisy-like flowers. Height & Spread 30cm (1ft).

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).

Rhodanthemum 'Zagora Pink' (Moroccan Daisy)

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

Saxifraga 'Peter Pan'

A compact, mound-forming, evergreen perennial with tiny grey-green leaves arranged in rosettes. In spring, it is covered with single, small rose-pink flowers with yellow centres. Height 10cm (4in), Spread 50cm (1.5ft).

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.

Sedum spathulifolium 'Purpureum' (Spoon-Leaved Stonecrop)

A mat forming, evergreen, perennial with branching, fleshy stems bearing rosettes of brittle, spoon-shaped, silvery, reddish purple-flushed, mid-green leaves & clusters of bright yellow flowers in summer.