The present invention provides herbicidal formulation that is composed of an aqueous liquid having suspended therein a multitude of microcapsules having a capsule wall of a porous polymer encapsulating a solution of clomazone, and suitable concentrations of fat in the absence of a resin, or a resin in the absence of a fat, or both fat and resin. Preferably, if included, the fat is at least 95% saturated.