Air plants (Tillandsia spp.) are epiphytes, meaning that in nature they grow on other plants, usually on tree branches. There are hundreds of species and varieties of air plants. They usually have strap-shape or slender triangle-shape leaves that grow in a rosette pattern with new growth appearing from the center. Air plants don't have roots like other plants; they only have a few short ones which are meant to help hold it onto whatever surface it's on. To water, place them in the sink or a small jar with enough water to submerge your plants. Let them soak for about half an hour, then give them a gentle shake or two to dislodge some water before turning them upside down on a towel to let them drain.