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.

Cal-IPC Rating: Limited

CDFA Rating: B*

Cal-IPC Assessment

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.

Weed Management Notes

  • Management Notes - Information on management techniques and effectiveness from the University of California Cooperative Extension’s Weed Research & Information Center.

Cal-IPC Newsletter Articles

Cal-IPC Symposium Presentations

Presentations are linked where available. Where a presentation is not available, find more information by reading the abstract in the Cal-IPC Symposia Archive.

There are no Symposium presentations associated with this species yet.

Other Senecio jacobaea Information

  • CalPhotos - Images of plants taken mostly in California.
  • Calflora - See the distribution of this species on Calflora's map of California.
  • CalWeedMapper - Distribution information with ability to determine regional priorities.
  • Jepson Online Interchange for California Flora - Information on taxonomy, biology, and distribution from UC Berkeley's Jepson Herbarium.
  • CDFA - California official noxious weeds.
  • USDA PLANTS Database - Federal database with information on identification and distribution, and links to websites in individual states.
  • Bugwood - National database from the Center for Invasive Species and Ecosystem Health at the University of Georgia.
  • EDDMapS - North American distribution based on Early Detection and Distribution Mapping System.