A synergistic herbicidal composition is provided, the composition comprising a herbicidally effective amount of (A) flufenacet and (B) florasulam. A method of controlling plant growth at a locus comprises applying to the locus herbicidally effective amounts of both flufenacet and florasulam.本發明提供一種有增效作用的除草劑組成物,該組成物包含除草有效量(A)氟噻草胺和(B)雙氟磺草胺。一種防治植株在所在位置生長的方法,其包括向所在位置施用除草有效量的氟噻草胺和雙氟磺草胺。