The large, branched taproot may reach more than 5 feet deep. Although the weed sometimes spreads from underground portions of the root system, it spreads mainly by seeds. Prominent cream colored mid-rib extending from leaf to base. Each mature pod contains one brownish-yellow seed. Pods change from green to black or dark brown when mature.
Fruits hang downward giving the plant an overall umbrella-like appearance.
If you see a plant fitting this description, please contact your local county weed district or extension office. Seed Germination A chemical isolated from the seed pods of dyer's woad is known to effectively inhibit the germination of seeds from other plants as well as dyer's woad. Delayed germination of dyer's woad seed may enhance its survival by ensuring a future seed source. Therefore, it is important that when plants are found they are not allowed to produce seeds. Dyer's woad also inhibits the growth of competing plants.