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Perennial Pepperweed

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Yellow Starthistle

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Dalmatian Toadflax

Yellow Toadflax

Dyer's Woad

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Dyer's Woad
Isatis tinctoria
 
Rosette

Leaves are blue-green with a whitish midrib.
Adult

Dyer's woad may be a winter annual, biennial, or a short-lived perennial. Heights of one to four feet are common. A thick tap root may penetrate to five feet deep.
Flower

The bright yellow flowers bloom and are highly visible in late spring.
Weed Infestation

Dyer's woad was introduced from Europe for production of textile dyes. It thrives in waste areas, gravel pits, road sides, pastures, field edges, and disturbed soils.
Seeds

Club shaped seed pods each produce a single seed. As the fruits mature they turn from green to dark brown or nearly black.
Biocontrol - Rust

Rust infected plants have a curley puckered look and are usually smaller than surrounding woad plants. Rust is located under the leaf surface and appears as small reddish-brown spots.
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