Anemone ‘Pretty Lady Diana’ Japanese anemones are among the latest-blooming perennials, giving gardeners4 an alternative to mums, asters, and sedums. This new introduction from Blooms of Bressingham is an unusually compact, sturdy selection with deep pink flowers. It needs no staking and blooms heavily in September and October. Flower stems reach about 16 inches tall. Thrives in full sun to part shade. Hardy in USDA Zones 5-9.