A synergistic herbicidal composition is provided, the composition comprising a herbicidally effective amount of (A) flufenacet and (B) mesotrione. A method of controlling plant growth at a locus comprises applying to the locus herbicidally effective amounts of both flufenacet and mesotrione.本發明提供一種有增效作用的除草組成物,該組成物包含有效除草劑量的組分(A)氟噻草胺和(B)甲基磺草酮。一種控制在一位置之植物生長的方法,其包含在該位置施用除草有效量的氟噻草胺和甲基磺草酮。