One of my favorite dye blogs is Rihivilla Dyeing with natural dyes. Wonderful pictures and good information. The current post: Riihivilla, Dyeing with natural dyes: Now in my garden Nyt puutarhassa has a good picture (scroll down a bit) of what Woad seeds look link when ready to harvest.
Pictures of my going-to-seed Woad plant below. (Hand in pictures to give an idea of the size of the seeds.)
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