Blood Meal 12-0-0 Soil Amendment is a powerful organic source of nitrogen. A slaughterhouse byproduct, this powder can also be used as a rabbit repellent, and to kick start weak composting systems. Blood Meal is a 100% organic, processed and sanitized granular product. It is an excellent source of natural slow release Nitrogen (N) and supplements for all plants & soil types. It contains a diverse mix of amino acids and proteins which boost plant growth.