Expert Gardener Bone Meal Plant Food, 3-15-0 Fertilizer, 4 lb. is an all natural organic source of Nitrogen and Phosphorus. Expert Gardener Bone Meal helps develop sturdy root systems and promotes plant growth and is ideal as a supplement for Bulbs, Flowers and Roses, as well as many vegetable including Beets, Carrots and Potatoes. Recommended for Organic gardening, Expert Gardener Bone Meal Plant Food is a natural way to feed plants, that needs additional phosphorus to help with root development.