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All Species

Tansy Ragwort

Senecio jacobaea
David Rasp, CC BY 4.0, via Wikimedia Commons

Why is it a problem?

  • Produces roughly 4,760 – 174,230 seeds per plant – seeds remain viable for several years
  • Seeds dispersed by wind, water, animals, vehicles, as well as in contaminated hay, grain seeds, and topsoil
  • Reproduces vegetatively from roots
  • Plant damage encourages growth and intensifies infestations
  • Toxic to livestock
  • Toxins can pass into the milk of affected cows and goats, and honey made by bees that visit tansy ragwort flowers is said to be unpalatable

How do I manage this plant?

  • Small infestations can be controlled manually by pulling up the entire plant, including its roots. Roots left in the ground may resprout. Wear gloves!
  • Plowing, mowing, and burning may intensify growth
  • Not effectively controlled by herbicides
  • Seed/plant pastures with non-invasive plants to encourage competition and suppress seed germination of common tansy
  • To prevent introduction, purchase Certified Weed-Free Forage

More info on species biology

Illustration by Carl Axel Magnus Lindman, Public Domain; Christian Fischer, CC BY-SA 3.0, via Wikimedia Commons