|Other names:||marestail, horseweed fleabane, mares tail, Canadian horseweed, Canada horseweed, fleabane|
Leaves are thin with lobed ends and white hairs on the back. The small, white flowerheads appear in mid to late summer. Along with ragweed, this weed's pollen is one of the leading causes of fall allergies. Prefers full sun and tolerates drought. Grows 2 to 5 ft. tall.