Black Gold 1390302 16-Quart Earthworm Castings Listed by the organic materials review institute for the production of organic food and fiber All organic soil amendment that's excellent for use as a top dressing, diluted to make a rich liquid tea, or mixed with any soil to stimulate plant growth Earthworm castings improve soil structure and increase microbial activity in a way that out performs most commercial fertilizers Minerals and nutrients from earthworm castings are in a water soluble form, readily available to plants Regionally formulated