Veronica 'Shirley Blue' Speedwell. A mat-forming perennial with greyish green leaves. Upright stems of vivid blue flowers from late spring to mid-summer. Height 25cm. Spread 30cm. Flowers from May to July. Herbaceous. Hardy.
A mat-forming perennial with glossy, purple-tinged, mid-green leaves, bronze in winter. Deep blue flowers in spring and summer. Very free-flowering. Height 20cm. Spread 60cm. Flowers from March to April. Evergreen. Hardy.
Viola sororia 'Albiflora' Northern White Violet. A stemless perennial with rounded leaves tinged purple. White flowers on short stems in spring. Height 5cm. Spread 30cm. Flowers from April to May. . Hardy.