Tansy Ragwort


Tansy Ragwort (Senecio jacobaea) Sunflower family

Short-lived perennial with one to several stems arising from a taproot. The plant grows 1 to 4 feet tall. Leaves deeply cut. Basal leaves stalked 2 to 8 inches long.Leaves become smaller and petioles become shorter moving up the stem. Flower heads borne in terminal clusters, heads consist of yellow ray and orange disc florets. Ray florets or “petals”number 10 to 13.

Contains a toxic compound responsible for considerable livestock mortality. It is estimated that the state of Oregon has lost $7 million per year to livestock poisoning by this plant.

Not known to occur in the Kenai Peninsula. Found in waste places, roadsides, clear-cuts, and meadows.

More information


UAF Cooperative Extension Service U.S. Forest Service Kenai Watershed Forum Homer Soil and Water Conservation District National Park Service U.S. Fish and Wildlife Service