NO TREE FERN. Works the same as classic ABG mix, but without the unsustainable tree fern LONG LASTING: Specifically designed to break down slowly, making it prime for use in terrariums/vivariums PLANTS THRIVE: Enables a huge variety of plants, especially tropicals and houseplants, to thrive BIO-BALANCED: Each of the multiple ingredients in this precise mix support a balanced ecosystem EXCELLENT FOR CULTURING: Great for springtails, isopods, and other similar insects Josh's Frogs Dart Frog Bioactive Vivarium Substrate is the perfect blend for growing tropical plants both in the home and in bioactive vivariums! Our mix is a more eco-friendly modification on the original ABG Mix developed by Atlanta Botanical Gardens - it doesn't contain tree fern! Each bag is a precise mixture of charcoal, milled sphagnum moss, fir bark, expanded slate, and peat. The mixture creates the perfect balance between retaining moisture and proper drainage; it can last for several years if used properly!