Exo Terra Plantation Soil Tropical Terrarium Substrate is made from compressed coconut husk fiber from the plantations of tropical Asia. This ecological substrate is ideal for increasing humidity in the terrarium and is totally safe for frogs, salamanders and burrowing or digging animals. Exo Terra Plantation Soil Tropical Terrarium Substrate can also be used as an incubation medium because of its hygroscopic properties. This 100-percent natural substrate can even be used as a nutritional planting soil for live plants in a terrarium set-up.