Worm Castings provide beneficial microbes that compete with disease causing organisms. They are a natural organic soil conditioner. It helps loosen hard soil, improve soil aeration and conserve water. An excellent addition to native soils. Microbes supplied by Worm Castings compete for available food sources. Worn Castings enrich soil in micro-organisms, adds plant hormones such as auxins and gibberellic acid, and adds enzymes such as phosphates and cellulose.