Invasive Species Council of British Columbia
Invasive Plant

Tansy ragwort

Senecio jacobaea
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Tansy ragwort can cause liver damage in livestock.

About This Species

Tansy ragwort (Common ragwort, Stinking willie, Staggerwort) is a biennial to short-lived perennial that grows in pasturelands and disturbed areas. Seeds are easily transported by wind, soils, human activity, and livestock. A single plant can produce 150,000 seeds that can survive in the soil for up to 15 years. Tansy ragwort is designated as a Provincial Noxious Weed by the BC Weed Control Act, as well as a Management species by the BC Provincial Priority Invasive Species List. 

How to Identify

Tansy ragwort can grow to be 0.2-1.2 m in height with purplish stems. 

It has bright yellow daisy-like flowers with 10-15 petals each. Flowers are arranged in a dense, flat-topped cluster. 

Leaves are dark green and ruffled, becoming ragged in appearance during their second year of growth.  


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