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.
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.