Terrariums are small transparent open or closed containers in which live a collection of small plants.  Terrariums make excellent gifts, office or home décor, wedding decorations or party favors.  Terrariums are low maintenance once established as their water is recycled, turning from liquid form to gas and returning to water. As moisture in the air condenses on the terrarim’s glass walls, it returns to the soil and is absorbed by the plants’ roots.