09/04/2026
If you've noticed clusters of bright yellow, daisy-like flowers blooming along roadsides and open spaces this summer, there's a good chance you've spotted tansy ragwort.
Tansy ragwort (Jacobaea vulgaris) is a non-native plant that’s classified as a Class B noxious w**d and is on the Washington State Department of Agriculture's prohibited plants list. It’s commonly found in open, disturbed areas and can be identified by its dark green, ruffled rosette leaves in its first year. Left unchecked, it can crowd out native plants and impact habitat quality for wildlife.
The good news? Tansy ragwort is relatively easy to pull by hand because of its shallow roots. But by late summer, timing matters: plants may already be producing seed. If you pull a flowering plant, remove as much of the root as possible and carefully bag the seed head for disposal in the trash to help prevent seeds from spreading.
Like so much of land stewardship, managing problem plants is about persistence. Each instance that we’re able to address before it spreads helps give our native species a stronger chance to thrive.