AncientForest® soil amendment Ancient Forest is a natural product consisting of 100% pure forest humus. It is derived from thousands of years of naturally decomposed forest litter that contains a wide spectrum of organic compounds. An incredibly high diversity of microorganisms, with more than 35,000 species of bacteria and over 5000 species of fungi, make Ancient Forest an ideal amendment for gardening and potting soils. Ancient Forest also aids in the retention of water and nutrients; creating stable, long lasting soil for your garden. The immense biological activity also makes Ancient Forest the ideal inoculum for actively aerated compost teas.