Dr. Earth’s Super Natural Lawn Fertilizer is a superior homogenous blend of fish meal, fish bone meal, feather meal, potassium sulfate, alfalfa meal, calcium sulphate, seaweed extract, micorrhizae & beneficial soil microbes. Controls thatch build up by digeting thatch (the organic debris layer produced by grass roots, stolons and blades). This layer is located between the vegetative layer and the soil layer. Adds life to lawns by providing a broad spectrum of beneficial soil microbes plus three micorrhizae strains. This ensures nutrients are made available to the grass roots more effectively and at a steady rate.