have been attempts to use it to protect wood against decay without applying dangerous chemicals. Production of woad is increasing in the UK for use in inks, particularly for inkjet printers, and dyes. The plant can cause problems, however: Isatis tinctoria is classified as an invasive species in parts of the United States. Invasive and noxious weed In certain locations, the plant is classified as a non-native and invasive weed. It is listed as a noxious weed by the agriculture departments of several states in the western United States: Arizona, California, Colorado, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, and Wyoming. In Montana, it has been the target of an extensive, and largely successful, eradication attempt. Notes References Sources External links Woad.org.uk - All About Woad - Cultivation, Extraction, Dyeing with Woad, History and facts about woad The Former Woad Industry Rex Wailes in Transactions of the Newcomen Society, 1935-36 Vol 16. USDA information on Isatis tinctoria Brassicaceae Flora of Western Asia Flora of Siberia Medicinal plants of Asia Plant dyes Medicinal plants of Europe Plants used in traditional Chinese medicine Plants described in 1753 Taxa named by Carl Linnaeus