STOP THE SPREAD

OF DYER'S WOAD

dyer's woad poster

(pdf format)

Catagory 2

dyer's woad

Isatis tinctoria

BRASSICACEAE (Mustard family)

— winter annual, biennual or short-lived perennial

IDENTIFYING CHARACTERISTICS

  • Thick taprooted and lateral roots
  • Four yellow petals with purplish-
    brown hanging teardrop-shaped
    seedpods
  • Leaves have a white midrib on
    the upper surface

This is a general table provided as a quick reference only. Treatments behave differently in different ecosystems.
What works in some areas of montana may not work in others. These treatments may also affect native and desirable plants.

dyer's woad

cut mow
hand pull (wear gloves)
herbicide
biological control
reseeding
domestic animal
cultivate

effective

moderately effective-
effective in combination with other treatments
ineffective

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