Over the millennia weld has been used as a source of a brilliant yellow dye (most of the dye is contained in the seeds). When the dye of weld is combined with the blue dye of Isatis tinctoria (woad), the result is a brilliant green dye!
Water: Moist to Slightly Dry
Hardiness: Frost Hardy
Habit: Herbaceous biennial 2 to 5’ tall
Light: Full Sun to Partial Shade
Soil: Fertile loam, clay, or coarse gravelly soil
Origin: Middle East, North Africa, and the Mediterranean