Weed control comments on tansy ragwort


August 11, 2022

Tansy ragwort, Jacobea vulgaris, is a class B noxious weed in Washington. You might see its bright yellow flowers blooming in summer. This is a biennial plant that forms a rosette the first year, over-winters, then bolts to produce flowers and seeds the next year.

Tansy is toxic and can be lethal to cows and horses if it is grazed or baled with forage. Mowing or clipping can reduce flower and seed production. Digging or pulling the entire plant is best. Herbicides applied in the spring or fall are also effective.

If you need help with this noxious weed contact Andy Lea at Wahkiakum County Noxious Weed Control at 360-795-3852 or leaa@co.wahkikaum.wa.us.


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