Abstract: A method of purifying acifluorfen to achieve a purity of greater than about 85% by weight involves heating to dissolution a solution of an acifluorfen crude wet cake and at least one solvent from the group of 1,2-dichlorobenzene, monochlorobenzene, o-xylene and p-xylene, with the solution having from about 10 to about 30 weight percent of acifluorfen crude wet cake. The-solution is then cooled until crystals of purified acifluorfen form. The crystals are then filtered at a temperature within the range of from about 0.degree. to about 30.degree. C. The filtered crystals are then recovered.