Back last spring, I was excited to receive some woad seeds from a friend in Norway.
I’m unsure about the variety of woad these seeds were, but based on photos online, I suspected that they were European Woad ( Isatis Tinctoria ) versus Chinese Woad (Isatis Indigotica). The Chinese version apparently isn’t particularly good for dyeing, as it doesn’t have enough indigotin compared to the European variety.