A composition is provided, the composition comprising a herbicidally effective amount of (A) amicarbazone and (B) metsulfuron-methyl. A method of controlling plant growth at a locus is also provided and comprises applying to the locus herbicidally effective amounts of both amicarbazone and metsulfuron-methyl. Also claimed is the use of a combination of amicarbazone and metsulfuron-methyl in the control of plant growth at a locus. Preferably the composition contains 20-85% by weight of amicarbazone and 0.5-10% by weight of metsulfuron-methyl, and may further comprise more auxiliaries. The plant growth may be controlled in a crop comprising cereal, coffee, fruit, pastures or sugarcane.