|Named for its sulfur-yellow flowerheads that fade to pale yellow in maturity. Clump-forming, carefree and generously blooming perennial for early and midsummer. Reaches 24 inches tall and about 18 inches wide. Grayish-green leaves are broad and linear in shape. 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.