dyer's woad, Isatis tinctoria

Dyer's woad has produced blue dye for us since antiquity. If it is used in combination with greenweed, it produces a very good green. In modern times it has been used as a wood preservative, as inkjet fluid color, and extensively in Chinese medicine. Here you could buy Woad Supreme to supplement your diet, even as you try to kill it because it is an invasive weed out west. It is reported from CA, CT, ID, IL, MT, NJ, NM, NV, NY, OR, UT, VA. WA, WV, WY, BC, ON, and QC. Beal Gardens, MSU, 6/5/20. Mustard family, Brassicaceae.