This all organic soil amendment is excellent for use as a top dressing, diluted to make a rich liquid “tea†or mixed with soil to stimulate plant growth. Black Gold® Earthworm Castings improves soil structure and increases microbial activity in a way that outperforms most commercial fertilizers. Minerals and nutrients from earthworm castings are in a water-soluble form, making them readily available to plants. Listed by the Organic Materials Review Institute (OMRI) for the production of organic food and fiber. Used as a top dressing, a "tea" or as an amendment in your soil.