Miracle-Gro EverGreen Mosskill Liquid guarantees a greener lawn in 3 days. It stimulates grass growth to cover bare areas, left by dead moss. Miracle-Gro Mosskill Liquid Lawn Food & Moss Control is high in Potassium which feeds the lawn and ensures thicker, greener grass with stronger roots, ready to absorb water and nutrients. Concentrated formula. Use April-September. How to use: Mark out areas to be treated and apply evenly at the following rates: Using a watering can: 150ml to 9 litres of water applied evenly over 10m². Using a sprayer: 150ml to 500ml of water applied evenly over 10m². Once the moss has turned died and turned black after 7-14 days you can rake it out. Avoid walking on treated areas until 100% dry.