Kalimeris incisa "Blue Star" (syn. Boltonia incisa)
This long-blooming, low maintenance beauty, with showy and the palest of blue ray flowers, grows to one and a half feet in full sun/partial shade. Not only is it easy to grow, but it often reblooms if the stems are cut after flowering. This clump forming perennial is just the ticket for a late summer bloom. Zones 5-9. Quarts.