Dr Earth 829 40-Pound Organic Super Natural Lawn Fertilizer Organic lawn fertilizer Controls thatch build up by digesting thatch in the organic debris layer produced by grass roots, stools and blades Adds life to lawns by providing a broad spectrum of beneficial soil microbes plus three mycorrhizae strains Promotes a hardy root system in two ways- stimulates roots to grow down into the soil and then mycorrhizae develops a symbiotic relationship with the grass roots causing the root system to expand Fast results