"Hidcote" supplies silvery foliage and dark purple-blue flowers from late spring to early summer: http://www.bhg.com/gardening/flowers/perennials/gardeners-guide-to-lavender/?socsrc=bhgpin021515englishlavender&page=4
beautiful blue. Nigella damascena (love-in-a-mist, ragged lady) is an annual garden flowering plant, belonging to the buttercup family Ranunculaceae. It is native to southern Europe, north Africa and southwest Asia, where it is found on neglected, damp patches of land. This easily-grown plant has been a familiar subject in English cottage gardens since Elizabethan times.