Senecio jacobaea

Senecio jacobaea_tansy ragwort_JM DiTomaso
Photo courtesy Joseph DiTomaso

Common names: tansy ragwort; stinking willie; stavewort; kettle-dock; felonweed; Fairies' horse; tansy butterweed; staggerwort

Senecio jacobaea (tansy ragwort) is a noxious biennial, perennial, or winter annual forb/herb (family Asteraceae) found in northern California, along disturbed places, roadsides, and waste sites. This plant is poisonous if consumed by forage animals. Bees foraging on tansy ragwort produce bitter honey that is tainted with alkaloids.

Rating: Limited

Cal-IPC Resources

  • Plant Assessment Form - Information gathered by Cal-IPC on the impacts, rate of spread, and distribution of invasive plants in California. Does not include management information.
  • CalWeedMapper - Statewide maps, climate models, and reports.
  • Cal-IPC News - Our quarterly newsletter. Each issue is available as a pdf.
  • Cal-IPC Symposium Proceedings - Presentations and papers from our annual Symposium.
  • Don't Plant a Pest! - Select your region to find non-invasive alternatives to ornamental species. Also see our statewide brochure on trees.

Other Resources

Symposium Presentations

  • Carrithers, V. F. (1997). Using Transline* herbicide to control invasive plants. California Exotic Pest Plant Council Symposium '97. Concord, CA.
  • Thomsen, C. D., W. A. Williams, et al. (1996). Yellow starthistle management with grazing, mowing, and competitive plantings. California Exotic Pest Plant Council Symposium '96. San Diego, CA.

Cal-IPC News Articles

  • (1995). Biological control of invasive exotic pest plant species: A report on the importance of maintaining and enhancing our nation's biological control capabilities. CalEPPC News. 3: 6-10.
  • Elliott, W. (1994). German ivy engulfing riparian forests and heading for the uplands. CalEPPC News. 2: 9.
  • Pitcairn, M. (2000). All weeds that have approved biological control agents, accidental introductions and others. CalEPPC News. 8.