Black Castings are Mother Nature's Purest form of slow release natural organic plant food produced by earthworms. Derived from a proprietary process and blend of pure organics, Black Castings are raised in a controlled vermiculture feeding process and microbial enhancements, resulting in a consistent, bio-diverse, living organic fertilizer and conditioner for safe use in everything that grows. No human, animal or food wastes are used in the process. Black Castings poses no risks to the end user. No Odor!