Aster novi-belgii - Hardy clump forming perennial. 80-100cms height, 30-50cms width. Full sun to part shade. Lovely daisy like flowers in summer and autumn en masse. Flowers are purple with yellow centres. Likes an airy open position in a moist well drained soil. Prune back after flowering, to promote fresh growth and more flowers. Also cut back in the winter. Frost hardy plant.