Brassica rapa

Brassica rapa_Birdsrape mustard_flowers_JM DiTomaso
Photo courtesy Joseph DiTomaso

Synonyms: Brassica campestris L.

Common names: field mustard; turnip

Brassica rapa (birdsrape mustard, field mustard) is a winter annual herb (family Brassicaceae) located throughout California. Birdsrape is resistant to frost and mild freezes and is an aggressive plant that grows profusely and may produce allelopathic chemicals that inhibit germination of native plants. Buried seeds can survive 50 years or more.

Cal-IPC Rating: Limited

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 RIC 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

There are no newsletter articles associated with this species yet.

Cal-IPC Symposium Presentations

  • Archbald, G. (1998). Mechanical control methods: beyond weed bashing. California Exotic Pest Plant Council Symposium '98. Ontario, CA.
  • Lair, K., N. Ritter, et al. (2006). Restoration of retired San Joaquin Valley farmlands using herbicides and activated charcoal. Cal-IPC Symposium. Rohnert Park, CA.

Other Brassica rapa 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.
  • USDA PLANTS Database - Federal database with information on identification and distribution, and links to websites in individual states.