Methods for controlling aquatic weeds using halauxifen or florpyrauxifen or agriculturally acceptable esters or salts thereof in combination with one or more of diquat dibromide, copper salts, endothal, or fluridone, or agriculturally acceptable salts or esters thereof, are described. The herbicidal compositions described allow for effective control and/or selectivity when treating a body of water, to control target aquatic weed populations, such as alligatorweed, yellow nutsedge, barnyardgrass, early watergrass, Echinochloa species, saramollagrass, Chinese sprangletop, hydrilla, Eurasian watermilfoil and/or curlyleaf pondweed.