Yarrow is an erect, herbaceous perennial plant that produces one to several stems. Hairy leaves are evenly distributed along the stems. The narrow leaves are finely divided, almost feathery, and arranged spirally on the stems. Flower clusters contain ray and disk flowers which are white to pink. The inflorescence is produced in a flat-topped cluster. Yarrow commonly flowers from May through June on mildly disturbed sites such as grasslands and open forests.