7 Reasons To Use Bone Meal Fertilizer In The GardenBone meal is a nutrient-rich, organic powder or granules made from ground animal bones, primarily used as a slow-release fertilizer to promote strong root growth, flowering, and fruiting in plants due to its high content of phosphorus and calcium, plus a bit of nitrogen. It’s a byproduct of the meat industry, made by cleaning, steaming, and grinding bones, offering an environmentally friendly way to enrich soil for healthier plant development, especially for bulbs and flowering shrubs.