Burdock is any of a group of biennial thistles in the genus Arctium, family Asteraceae. Native to the Old World, several species have been widely introduced worldwide. Plants of the genus Arctium have dark green leaves that can grow up to 18" (45 cm) long. They are generally large, coarse and ovate, with the lower ones being heart-shaped. They are woolly underneath. The leafstalks are generally hollow. Arctium species generally flower from July through October. The prickly heads of these plants are noted for easily catching on to fur and clothing, thus providing an excellent mechanism for seed dispersal. Burr cause local irritation and can possibly cause intestinal hairballs in pets. However, most animals avoid ingesting these plants. A large number of species have been placed in genus Arctium at one time or another, but most of them are now clas

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