Burdock, Common


Common burdock is a biennial that grows as a rosette of leaves the first year and then produces a 5-foot tall, erect, bushy flowering stem. Rosette leaves are distinctive due to their large size, heart-shaped base, wooly under surface, and hollow leaf stalks. Stem leaves are similar to but smaller than rosette leaves. Located at the ends of branches or at leaf axils on the flower stem are flower heads comprised of a bur with hooked bristles beneath a closely packed cluster of tubular, purplish flowers. The plant reproduces by seed. It is best known for its burs that stick to pet fur and clothing.

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