Down To Earth’s Fish Bone Powder 4-20-0 is a high quality, free flowing phosphate fertilizer for supplementing plant nutrient requirements or correcting deficiencies in all types of plants including vegetables, flowers, herbs, trees, shrubs, and vines. It is derived from fish bone using an advanced enzymatic hydrolyzation process and ground to a fine powder for easy and uniform application. Phosphate is an essential nutrient for growing plants and an adequate seasonal supply encourages plenty of buds, flowers, fruits, and vegetables.