TERRA BASE is a product for keeping small orchids, ferns, moss growing in a state close to the condition of natural habitat, like trunk of trees in the rainforests. Because of pottery-mode cylindrical body, water oozes little by little on the surface and the surface temperature drops due to heat of vaporization if you fill the water inside. With this property, the optimal conditions are easily set up to grow epiphytic plants that prefer cool and humid environment.