Common Cocklebur

Xanthium strumarium

Common cocklebur
Common cocklebur. Photo courtesy of NY State IPM Program Licensed under CC BY 2.0.
Common cocklebur is a highly competitive annual weed. It can grow to 6ft in height and produces burs which cling to animals.
Common cocklebur
Common cocklebur. Photo courtesy of Jan Samanek. Licensed under CC BY 3.0.