A composition comprising a herbicidally effective amount of metribuzin and flupyrsulfuron. Also claimed is a method of controlling plant growth at a locus comprising applying to the plants or to the locus thereof herbicidally effective amounts of metribuzin and flupyrsulfuron. There is also a claim to the use of the combination of metribuzin and flupyrsulfuron in the control of plant growth at a locus. Preferably the plant growth is being controlled in a crop comprising cereals, leguminous plants, fibre plants and vegetables; specifically one or more of broadleaves, grasses and sedges.