GAIA GREEN Bone Meal is a premium fertilizer for garden and nursery use. As a slow-release fertilizer, GAIA GREEN Bone Meal is primarily used as a source of phosphorus and calcium. High in calcium carbonate, Bone Meal behaves like lime, raising soil pH. We recommend the efficient and economic use of Bone Meal beneath garden rows and transplants to supply the immediate root zones, particularly in acid soils. Bone Meal is used widely in the planting hole when setting out bulbs and to coat the cut surfaces of seed potatoes.