|Clump-forming, carefree and generously blooming perennial for early and midsummer. Reaches 24 inches tall and about 18 inches wide. Leaves are linear and broad and grayish green in color. Flowerheads form corymbs 4 inches across in yellow. Color will fade to paler yellow with age. 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. Sometimes referred to as Achillea 'Schwefelblute'.