All natural source of organic nitrogen and phosphorous. Bone meal is a by-product from meat (rendering factories). It consists of ground animal bones that have been cooked and sterilized, then ground into a meal. Bone meal helps develop sturdy root systems and stimulates plant growth. Espoma bone meal is an ideal supplement to fertilizers for bulbs, flowers, and roses. It is all-natural and approved for organic gardening. USDA (United States Department of Agriculture) Certified Organic.