Why Use Aftercut Moss Killer? Greener Lawn The right amount of nitrogen will green the lawn & effects can be seen in 7 days Kills Moss Iron will kill the moss and it will turn black as it dies. Any discoloration of the lawn is temporary Builds Roots Potassium helps to move carbohydrates to the roots for essential energy storage Why Use Aftercut Moss Killer? The right amount of nitrogen will green the lawn & effects can be seen in 7 days Iron kills the moss, creating a stronger lawn Suitable for use in spring & autumn when moss thrives Potassium aids essential energy storage for roots Balanced nutrient package avoids surge growth resulting in less mowing