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Species
Information
- Dyer's
woad
- Isatis
tinctoria L.
- USDA
Symbol: ISTI
- Oregon
Noxious Weed Designation: B
- Pictures
Identification:
Perennial or biennial; flowers May to June. Grows to 3 ft tall. Stems simple below and multi-branched above. Small yellow flowers with 4 petals. Bears flattened, winged seed pods.
Impacts:
Dyer's woad forms dense stands in rangelands which crowds out native vegetation. Flowering and the most vigorous growth will occur mainly in sandy and gravelly soils, and in marginal farm lands.
Biological
Controls: No approved biological control agents are available.
Oregon
Maps of Dyer's Woad Distribution
Links:
USDA
Plants Database information on Dyer's woad
GRIN
Database information on Dyer's woad
Oregon Department
of Agriculture information on Dyer's
woad
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