A herbicidal composition is provided, the composition comprising: (A) the crystalline modification I of 2-(4-mesyl-2-nitrobenzoyl)cyclohexane-1,3-dione (mesotrione) and (B) the crystalline modification I of methyl 2-[(4,6-dimethoxypyrimidin-2-ylcarbamoyl)sulfamoyl]-α-(methanesulfonamido)-p-toluate (mesosulfuron-methyl). A method of controlling undesirable plant growth at a locus comprises applying to the locus herbicidally effective amounts of both (A) the crystalline modification I of 2-(4-mesyl-2-nitrobenzoyl)cyclohexane-1,3-dione (mesotrione) and (B) the crystalline modification I of methyl 2-[(4,6-dimethoxypyrimidin-2-ylcarbamoyl)sulfamoyl]-α-(methanesulfonamido)-p-toluate (mesosulfuron-methyl).
