Bat guano and seabird guano have been used throughout the ages as a highly effective means of growing. It is a completely natural source of nutrients that is easy for plants to utilize. Guano is great for use with any kind of plant and different varieties are available to best suit individual growing needs. Many of these guano sources are ancient deposits that are completely decomposed and ready for use by the plants. Guano is a great alternative to chemical fertilizers and is a high quality, organic resource for growing nutrients.