Down To Earth™ Bone Meal 3-15-0 is a good source of phosphorous and calcium for flowering plants, trees and ornamentals, and is also an ideal organic fertilizer when planting bulbs. As one of the three big nutrients for plants, phosphorous plays a role in both root and bloom development, which helps produce high-quality fruit and flowers. Strong root development means plants will grow faster and be healthier because they can absorb more water and nutrients from the soil.