Dyer's woad is natively found across the temperate regions of Central and Western Asia, extending through parts of Eastern Europe. This plant has been introduced and cultivated in various regions across Europe, Asia, the Americas, and Australia, indicating a vast global presence beyond its native range.

Dyer's woad hails from East Asia, and is a common weed due to its ability to reproduce and spread quickly. It has the capacity to cover large areas, putting native species at risk. It's harmful to gardens because it can out-compete other plants for resources, which can stunt the growth of desired flora or make it impossible for them to survive. Moreover, dyer's woad has a deep root system, making it difficult to eradicate once it gets established. If you're growing this plant in your garden, look out for its distinctive features - clusters of yellow flowers and blue-green leaves. Dyer's woad mainly spreads through seed dispersal. The seeds can be distributed by various means such as wind, water, or animals. This allows the plant to colonize new areas rapidly, making it difficult to control.

The best time to control or remove dyer's woad is during the spring before the plants flower and set seed to prevent further spread.