Roots of this hardy perennial herb have been used for centuries to produce a red dye. Harvest roots and rhizomes of three-year-old plants in the spring and autumn. Grow plants in full sun and average soils. Loose soils will increase root growth and make for easy harvest. 2 plants will dye 4 ounces of wool.
Height and spread 2’ x 2’. Plants are sprawling in habit. Zones 4-9.
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Photo of madder-dyed wool by Fran Rushworth of Rich & Strange Silk and Wool Work. Check out her experience using madder to dye wool here.