A slow release organic fertilizer which encourages root development. NPK 3.5-20-0. Vitax sterilised bonemeal is an organic fertilizer which provides both phosphates and nitrogen, two elements essential for healthy plant growth. This slow, steady release of nutrients over a long period makes Bonemeal an ideal fertilizer for bulbs and herbaceous plants, shrubs, roses, fruit trees and strawberries. Apply as required during the growing season. How to Use Can be applied prior to sowing or planting. Can be applied as a top dressing for roses, border plants, fruit trees and bushes. Size 1.25Kg box.