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 sodium salt of methyl 4-iodo-2-[[[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino] carbonyl]amino]sulfonyl]benzoate (iodosulfuron-methyl-sodium). 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 sodium salt of methyl 4-iodo-2-[[[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino] carbonyl]amino]sulfonyl]benzoate (iodosulfuron-methyl-sodium).
