Anemone nemorosa (Wood anemone): Low growing, pure white anemone which flowers in early spring. Hardy. To 10cm

Centaurea montana 'Purple Heart' (Perennial cornflower 'Purple Heart'): Large white cornflower-like flowers with violet central markings. Loved by bees and butterflies. To 30cm.

Geranium macrorrhizum 'Album' (Rock cranesbill 'Album'): Superb ground cover Geranium especially for dry shade. White flowers with definite hint of pink. Aromatic foliage. Hardy. To 30cm.