Yarrow (Common Milfoil)
A hairy, aromatic perennial with a simple or branching stem. Flowerheads minute, in dense, flat-topped, terminal clusters. Ray florets minute, white, rarely light pink, disk florets light yellow. Blooms May–November. Leaves finely dissected, fernlike, to 10 inches long, narrow-oblong, alternate. The odor is distinctively sweet and rather soapy, akin to the smell of chrysanthemums.
Several cultivars have been developed for the gardener, with a variety of flower colors.