Our Wine Bottle Terrarium is a small enclosed two-tiered environment, planted with a Pink Fittonia and a Red Fittonia. Think of the terrarium as a mini-greenhouse, the plants and soil inside release water vapor acting as a recycling system for the water. The vapor is collected on the walls of the vessel and then trickles down to water your plant. Terrariums are self-nourishing, which is why they require little to no maintenance.