Burdock is a perennial whose roots, leaves, and sometimes its seeds are used widely in herbal medicine to support liver function and as a cleansing botanical. Like dandelion and yellow dock, burdock roots are bitter and thus capable of stimulating digestive secretions and aiding digestion. These roots are referred to as "alterative" agents -- capable of enhancing digestion and the absorption of nutrients and supporting the elimination of wastes. Any botanical capable of these important actions can attain far-reaching improvements in a variety of complaints. Now through fall is a time to harvest.