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Hemp dogbane (Apocynum cannabinum) is a perennial weed spread by seed and rhizome. It can be confused with milkweed because stems exude milky sap when broken. Small leaves (2 to 5 inches long and 1 to 2 inches wide) are thick and have white veins on their upper surfaces. Leaves are paired on opposite sides of stems, and they may be attached directly to stems or have short petioles. 

Hemp dogbane (Evans, University of Illinois, dogbane.

(Photo: Chris Evans, University of Illinois,



  • Cut repeatedly and/or cultivate at renovation.


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