August 1, 2025: The Dirt | Weed of the Month August 2025 | Tansy Ragwort (Senecio jacobaea)
Tansy ragwort is an invader of upland prairies, pastures, and anywhere in full sun. The leaves are distinctly crinkly and lobed. This species exhibits either biennial (<2-years) or perennial (>2-years) lifecycles depending on the suitability of its growing conditions. It begins as a basal rosette of leaves and…