Disclosed herein are herbicidal compositions comprising a herbicidal effective amount of (a) an ethylene inhibitor, and (b) a compound defined by Formula (I), or an agriculturally acceptable salt or ester thereof: wherein X is hydrogen or fluorine. The ethylene inhibitor can be 1-methylcyclopropene. The weight ratio of 1-methylcyclopropene, in g ai/ha to the compound defined by Formula (I), or an agriculturally acceptable salt or ester thereof, in g ai/ha can be from 1:1000 to 400:1. 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 limit the emergence or growth of vegetation the composition described above.