Dyers woad (Isatis tinctoria) is an invasive plant. It is a native of Eurasia and was first detected in Utah in 1984.
In certain locations the plant is classified as non-native and invasive weed. It is listed as a noxious weed by the agriculture departments of several states in the western United States. In Montana, it has been the target of an extensive, and largely successful, eradication attempt.
For more information about this plant pest, see the CABI data sheet.