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-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]amino]sulfonyl]benzoate (metsulfuron-methyl). A method of controlling 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-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]amino]sulfonyl]benzoate (metsulfuron-methyl).