When blooming and ripening fruit, good phosphorus levels are very important. Straight from Indonesia, Buried Treasure® Phos Seabird Guano is a natural fertilizer that contains phosphorus. It can be used indoors or outdoors on vegetables, herbs, flowers, ornamentals, and in hydroponic applications. Buried Treasure® Guano is micronized for better solubility and delivery. Does not contain fillers.