Do you want a moss free lawn,the envy of the whole neighbourhood? Then treat your lawn to a quick tonic! Maxicrop Moss Killer & Lawn Tonic is a 2-in-1 solution that contains a natural organic seaweed base, killing moss & offering rapid greening. With Seaweed Extract plus Ferrous sulphate & Nitrogen, this product blackens moss within hours and rapidly stimulates grass re-growth of the treated area. Also great for improving rooting.