Fish bone meal has slightly higher phosphorus and nitrogen than standard bone meal and breaks down a bit faster, which matters in cold spring soils where microbial activity is slow. It's also acceptable to those who prefer to avoid mammal-derived inputs.
 
For tomatoes: phosphorus supports fruit development; the slightly higher nitrogen suits a heavy-feeding crop. Work into the bed at planting alongside gypsum.
 
For general use: wherever you want a faster-acting phosphorus source than standard bone meal — spring plantings, cold soils, crops with shorter seasons.
 
Organic, 4-17-0 analysis.
 
Available in 1 lb and 5 lb bags.