A method of controlling moss by applying to grass infested with moss a dry composition including: a) a source of nitrogen such as isobutylenediurea or methylene urea; b) a non-ionic surfactant or wetting agent; c) a metal containing salt, and d) an acidic pH adjusting agent effective to adjust the pH of the composition to a pH of between 2.5 and 5 when wetted on grass. The dry composition may be a granular composition, and may be applied by broadcasting over a large area.