Dyer's woad

Capparales > Brassicaceae > Isatis tinctoria L.
Synonym(s): Dyers woad

Dyer's woad is a biennial plant that can grow from 1-4 ft. (0.3-1.2 m) tall. First years growth is represented by a rosette of hairy, bluish-green leaves 1.5-7 in. (3.7-18 cm) long. Stem leaves are lance-shaped and alternate with a cream-colored mid-rib. Yellow flowers with four petals appear in small clusters at the top of the stems in spring to late summer. Seed pods are flattened, 3/8 in. (0.9 cm) long, 1/4 in. (0.6 cm) wide and hang from short stalks at the ends of the stems. Dyer's woad is native to central Asia and northern Russia and was introduced to North America in the early 1900's as a contaminant in alfalfa seed. Plants occur in areas with poor, dry soils such as roadsides, rangelands and open forests.


Identification, Biology, Control and Management Resources

  • Weeds of the Week - USDA Forest Service, Northeastern Area, Forest Health Protection

Selected Images from Invasive.org

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Plant(s); rosette
Steve Dewey, Utah State University, Bugwood.org
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Foliage
Steve Dewey, Utah State University, Bugwood.org
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Feature(s); Roots
Steve Dewey, Utah State University, Bugwood.org
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Plant(s); in flower
Steve Dewey, Utah State University, Bugwood.org
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Plant(s); Up-rooted plant
Steve Dewey, Utah State University, Bugwood.org
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Flower(s);
Steve Dewey, Utah State University, Bugwood.org
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Fruit(s);
Steve Dewey, Utah State University, Bugwood.org
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Life Cycle ; Samples of reproduction, from flowers to mature fruits
Steve Dewey, Utah State University, Bugwood.org
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Flowers and Fruit
Steve Dewey, Utah State University, Bugwood.org
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Seed(s); seeds and fruit
Steve Dewey, Utah State University, Bugwood.org
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Seed(s);
Steve Dewey, Utah State University, Bugwood.org
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Plant(s);
Steve Dewey, Utah State University, Bugwood.org
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Plant(s); in flower
Steve Dewey, Utah State University, Bugwood.org
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Infestation;
Steve Dewey, Utah State University, Bugwood.org
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Infestation;
Steve Dewey, Utah State University, Bugwood.org
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Infestation;
Steve Dewey, Utah State University, Bugwood.org
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Infestation; 9 months after wildfire
Steve Dewey, Utah State University, Bugwood.org
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Infestation;
Steve Dewey, Utah State University, Bugwood.org
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Plant(s);
Steve Dewey, Utah State University, Bugwood.org
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Infestation;
Steve Dewey, Utah State University, Bugwood.org
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Control; Hand-pulling by cub scouts
Steve Dewey, Utah State University, Bugwood.org
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Invasive Reference(s):

Check Invasive.org for most current lists.
  • Arizona - Noxious Weed Law
  • California - Noxious Weed Law
  • California - Invasive Plant Inventory
  • Colorado - Noxious Weed Law
  • Montana - Noxious Weed Law
  • New Mexico - Noxious Weed Law
  • Nevada - Noxious Weed Law
  • Oregon - Noxious Weed Law
  • Utah - Noxious Weed Law
  • Washington - Noxious Weed Law
  • Wyonming - Noxious Weed Law
  • Mid-Atlantic - EPPC List
  • Invasive Plants: Western North America
  • Invasive Plants: Guide to Identification and the Impacts and Control of Common North American Species
  • Invasive Plants of the Upper Midwest


External Links


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USDA Forest Service Bugwood University of Georgia