Earthworm castings make the richest, most natural compost available. Naturally non-burning and odorless. Add essential organic matter that increases microbial activity for a living, nutrient rich soil. One application per month. Ideal to use for seed starting, indoor and outdoor plants, gardens (including container gardens), trees, and shrubs. Sprinkle a small amount in soil, the castings slowly enrich soil with more nutrients than most yard compost without burning plants. Honest earthworm castings, no peat or other fillers. Improves overall soil structure. Increases water and nutrient holding capacity of soil. Encourages plant growth. 100% guaranteed.