Rubia tinctorum

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’x2’. Plants are sprawling in habit. Z4-9

2″ pot

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.