Category: Organic fertilizer

According to the National Institutes of Health, fish bones are a rich and natural source of calcium and phosphorus, confirming that yes, fishbone meal does have calcium. This slow-release fertilizer is a valuable organic byproduct, making it an excellent soil amendment for gardeners looking to improve plant and soil health.

Typically, bone meal's phosphorus becomes available to plants over 1 to 4 months, though some is available immediately after application. The exact time frame for bone meal breakdown depends on soil conditions, particle size, and microbial activity.