Burdock is known for it's large taproots which are commonly eaten in Asia as a medicinal food with significant blood purifying properties. Traditionally taken internally for staph infections, impetigo and other skin infections. It has also been used to treat eczema, used both externally and internally. In Japan, China, and Korea, Burdock or Gobo, is a commonly used medicinal food. The root is steamed, stir-fried and cooked into stews. It also makes a tasty herbal vinegar. An excellent tonic safe for daily use. Recent medical evidence supports use for tumors. This is one of four herbs in the Essiac anti-cancer formula. Very easy to grow and likes a deep soil for best root production. Roots are dug the first fall. Dig before plant sets seed.Biennial Hardy to zone 5.