The undisputed champion of organic fertilizers Bat Guano 7-3-1 is rich in readily available Nitrogen Phosphorus and Micronutrients providing essential plant nutrition for vigorous vegetative growth and early fruit and flower development. Bat Guano is fast acting and highly effective when mixed into potting media applied as a sidedress or steeped to make a potent guano tea or foliar spray. OMRI listed.