|Hardy and strong rhizome producing perennial with simple, toothed, lance-shaped dark green leaves. Reaches 12 to 36 inches tall and about 24 inches wide. From early to late summer, flowerheads form loose corymbs to 4 inches across in off-white. This heat and drought tolerant perennial has a fiberous root system and can become invasive. Divide to maintain. Butterflies are attracted to this plant. Good cut flower that dries well too.