Guanokalong Guano Black Pellets are a blend of black guanokalong powder and humic acids. The powder comes from naturally fermented bat dung from the caves of Madagascar and Indonesia. It is rich in organic nutrients such as nitrogen, phosphorus, potassium, magnesium and calcium that promote plant growth. The slow release of nutrients over 3 to 6 months prevents root rot and supports microbial life in the soil. Guano Black is ideal for improving soil, reducing transplant stress and increasing water holding capacity.