A mound-forming, compact perennial, with divided feathery green-grey leaves. In summer and early autumn it produces large deep mauve-blue flowers with frilled edges and pale centres. These are held on ...
A clump-forming herbaceous perennial of dainty character. Leaves are narrow, oval, toothed and grey-green. In summer it bears branching, wiry stems of many pale yellow flowers in the typical petalled, ...