Poisonous Plants

Agronomy 105's Weed ID


Cocklebur seedlings are easy to identify because of their large, elongated cotyledons and red-colored hypocotyls.
The mature cocklebur plant retains its red stem and has large irregularly shaped leaves.
The seed pods (burs) are borne in clusters at the leaf axils or at the tips of the branches.  The bur, which contains the cocklebur seeds, is covered with curved spines that attach to animal hair and thus can be disseminated over long distances.  The slender seeds are about 1/2 inch long, dark brown and have pointed tips.  Each bur contains 2 seeds, one that is ready to germinate and one that will remain dormant for some time.