Disclosed herein are herbicidal compositions comprising a herbicidal effective amount of (a) aminopyralid, or an agriculturally acceptable salt or ester thereof, (b) triclopyr, or an agriculturally acceptable salt or ester thereof, and (c) an organosilicone surfactant. Also disclosed herein are methods of controlling undesirable vegetation, which comprise applying to vegetation or an area adjacent the vegetation or applying to soil or water to prevent the emergence or growth of vegetation (a) aminopyralid, or an agriculturally acceptable salt or ester thereof, (b) triclopyr, or an agriculturally acceptable salt or ester thereof, and (c) an organosilicone surfactant.