Worm castings are fertilizers made from material that passes through the alimentary canal of worms. This substance is high in both nutrients and beneficial microfauna. Castings are pH-neutral and can be used for diverse soil types. They also contain cocoons that promote the colonization of earthworms throughout the soil. Our Worm Castings have been screened to fine 1/8". Made with selected OMRI Listed and organic-compliant feed inputs.