Nature's Own Guano is bat manure. It is 100% organic and highly concentrated. It has been formed slowly over millions of years to produce a valuable and natural source of plant nutrients and essential trace elements. This simple and remarkable natural garden fertiliser works wonders on every plant from tomatoes and fruit through to roses, lawns and indoor gardens. Why are there two different types of Guano available? The chemical composition of Guano is dictated by many factors such as the species of bat, diet, location, climate (dry or humid) and age. As a result Guano is available as Guano Super grow for all the vegetative growth and Guano Super bloom for all flowering and fruiting needs. Guano can be used as the sole source of plant nutrition, or depending on crop needs, can be used in conjunction with chemical nutrients or vitamin supplements. Are there trace elements in Guano? Nature's Own Guano contains all trace elements needed to promote healthy plant growth, i.e. Manganese, Magnesium, Iron, Molybdenum, Cobalt, Sodium, Zinc and Calcium. Nature's Own Guano is 100% natural organic product and contains no heavy metals or man-made contaminants.