Dr Earth Super Natural Lawn Fertilizer Controls thatch build up by digesting thatch in the organic debris layer produced by grass roots, stolons and blades. Adds life to lawns by providing a broad spectrum of beneficial soil microbes plus three mycorrhizae strains. Promotes a hardy root system. Great for new lawns (seed or sod) fescue, blue grass, and st. Augustine cool or warm season grasses. Enriched With: Alaskan Fish Meal, Alaskan Fish Bone Meal, High Country Feather Meal, Naturally Mined Potassium Sulfate, Valley Grown Alfalfa Meal, Calcium Sulfate, Microactive Concentrated Seaweed Extract