Alchemilla mollis (Lady's mantle): Bright green soft leaves and a froth of acid yellow/green flowers in summer. Very easy for ground cover

Digitalis x mertonensis (Strawberry foxglove): Large, dusky pink flowers on sturdy spikes in mid-summer. Hardy. To 90cm.

Geranium phaeum 'Album' (Dusky cranesbill 'Album'): Clean white flowers held above bright green foliage. Excellent in shade. Spreading habit. Hardy. Height to 60cm.

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.