Burdock, a coarse biennial plant that is often a weed. It resembles the thistle, but only the flower head and fruits are prickly. The plant is also known as burweed, stick-button, and beggar's-button, because of the bristly burs that stick to clothing by means of hooked prickles.

Burdock is native to Europe and Asia, but is now found in most parts of North America. It has a coarse stem that sometimes reaches a height of nine feet (2.7 m). The leaves are large, green above and whitish beneath. The flower heads are purplish or white.

In southern Europe and Asia the young roots of the burdock have been used in making medicine. The Japanese cultivate the plant and eat the root as a vegetable.

Burdock is Arctium lappa of the family Compositae.