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Common Burdock (Arctium minus) Common burdock is a member of the Aster family. It is an introduced biennial, which reproduces by seeds. In the first year of growth the plant forms a rosette. The second year the plant grows erect. Burdock grows to 6 feet tall, has enormous leaves and a prickly bur. The flowers are purple and white in numerous heads. Burdock grows along roadsides, ditch banks, and neglected areas. This plant is a very serious threat to sheep as the burs can significantly damage the quality of their wool. Biological controls: None currently available. Chemical controls: There are many effective herbicides labeled for burdock control. Chemicals should be utilized prior to bud formation. For additional information contact your local city, county or town natural resource office. (See section VII for phone numbers.) Cultural controls: Minimize soil disturbances, encourage desirable plant growth. Mechanical controls: Top growth removal through mowing or cutting is effective. Pulling or digging out the plant at flowering or early seed formation is effective. Locations of Infestations of Common Burdock on Roads and Open Space in Pitkin County:
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