Mother Earth Nitro Bat Bat Guano is a single-ingredient bat guano supplemental fertilizer. From our cave to your garden, Mother Earth Nitro Bat Bat Guano 5-3-1 is sure to become your garden's new excellent friend. This dry fertilizer is great for oversized and fast growing plants of all kinds during the vegetative stage. Thanks to its high nitrogen content and ample supply of phosphorus, bat guano has been heralded for centuries as a secret weapon for keeping even the hungriest of plants satiated. Use this powerful single-ingredient fertilizer biweekly for heavy feeders or monthly for standard houseplants.