MO Bacter by Viano is a slow release organic lawn fertiliser and is endorsed by Royal Horticultural Society. This 20 KG bag covers 200m2 and is best applied from March-October. Granular organic fertiliser Rids lawns of moss and feeds grass at the same time Will not burn plants you accidentally put this product on Destroys moss without leaving black debris Moss is digested by bacteria (npk: 5-5-20) Does not stain stonework, patios and paths Stops the need to scarify lawns Does not harm animals or wildlife Organic