Dyer's Woad
(1A, very limited presence in Montana)
(Isatis tinctoria)
Quick ID
- bluish-green leaves with cream-colored midvein
- bright yellow flowers
- pear-shaped seed pods that turn deep purple to black upon maturity
- can be more than 3’ tall
Dyers Woad Plant
Video Information
Weed Images
Weed Specifications
Type | Information |
Toxicity | Non-toxic, but is unpalatable to livestock and reduces forage |
Best Management Practices | Hand pulling and digging, making sure to remove at least 3”-4” of the root, along with proper seed removal and disposal, and herbicide treatments *See management plan below |
Habitat | Establishes on disturbed sites, such as roadsides, railroads, and gravel pits |
Root | Taproot can exceed 5’ in depth, along with lateral roots |
Leaves | Rubbery, like cabbage, and clasp the stem |
Lifespan | Usually biennial, but sometimes annual or perennial |
Similar Looking Plants | Other mustards |
Important Information | Plants can grow 4” in one week, prolific seed producer, $50 bounty for infestations found more than a half mile from known populations |
Find Out More...
To Report, Contact:
Amber Burch
Beaverhead County Weed Coordinator
Montana Dyer’s Woad Task Force Coordinator
Phone: (406) 683-3790
E-mail: aburch@beaverheadcounty.org
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