horseweed

Also known as Canadian Horseweed, Canadian Fleabane, Coltstail, Marestail

Horseweed grows as an erect annual pioneer herb, producing a single dense central stem clothed in narrow, dark green leaves. During late summer, it caps itself with hundreds of tiny daisy-like floral heads featuring pale ray florets and yellow centers, releasing copious windborne seed heads. As an aggressive colonizer of disturbed soils, roadsides, and agricultural fields, it rapidly establishes deep taproots and adapts to diverse climatic conditions.