Alchemilla erythropoda (Dwarf Lady's Mantle): Compact form of familiar Lady's Mantle. Makes excellent ground cover in fairly sunny or semi-shaded spots. Hardy. Up to 20cm.

Campanula portenschlagiana 'Resholdt's Variety' (Wall bellflower 'Resholdt's Variety'): Carpeting alpine with brilliant blue flowers over a long flowering period in summer. Loves sun and good drainage. To 10cm

Erigeron karvinskianus (Fleabane): That pretty little daisy you see growing in the cracks in paving and walls in late summer....

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

Sempervivum 'Dark Beauty' (House leek 'Dark Beauty'): An attractive variety with dark red almost purple rosettes. Evergreen succulent pointed leaves and short stems of pink star like flowers. Hardy.

Stachys byzantina 'Silver Carpet' (Lamb's ears 'Silver Carpet'): Silver, furry leaves form spreading mats. A few spikes of silver flowers with the faintest hint of pink in summer.

Vinca minor f. alba 'Gertrude Jekyll' (Small white periwinkle 'Gertrude Jekyll'): A compact mat-forming evergreen perennial with trailing stems of dark green leaves. White flowers from mid spring to autumn.