Common names: dyer's woad
Isatis tinctoria (dyer’s woad) is a winter biennial or short-lived annual herb/forb (family Brassicaceae). Plants are highly competitive and often grow in dense colonies. It can be found distributed among the Klamath, Cascade, and North Coast Ranges, northern & central Sierra Nevada, Modoc Plateau, and northern San Francisco Bay region. Dyer’s woad is a noxious weed of rangeland, agronomic crops, and undisturbed natural areas.Cal-IPC Rating: Moderate?
CDFA Rating: B*?
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.
Species ID Card
Invasive Species ID Card - To support field identification of early detection species, Cal-IPC has designed a set of Species ID cards that can be downloaded, printed double-sided, and trimmed to size.
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
- Prioritizing Regional Response to Invasive Plants in the Sierra Nevada. Brusati, Elizabeth; Morawitz, Dana; Powell, Cynthia. Vol 19, Issue 2
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.
- Using detection dogs to enhance invasive plant management strategies. Hurt, Aimee (2020)
- Preventing weed spread via contaminated hay and straw. Clines, Joanna (2005)
Other Isatis tinctoria Information
- CalPhotos - Images of plants taken mostly in California.
- Calflora - Distribution map and records of this species in California.
- CalWeedMapper - Distribution map of this species in California with ability to determine regional priorities.
- EDDMapS - Distribution of this species in North America.
- Jepson Interchange - Information on this plant's taxonomy, biology, and distribution from UC Berkeley's Jepson Herbarium.
- USDA PLANTS Database - Information on identification and distribution, with links to websites in individual states.