Rock Shaped Self Watering Planter, 4" Diameter Opening Keep moisture loving plants alive and thriving with minimal attention year round--perfect for homes and offices. The outer pot holds enough water to keep a plant alive for one to three weeks--long enough to keep your plantshealthy while you are out of town on business or vacation. Ideal for such plants as: African Violets, Asparagus Fern, Boston Fern, Christmas Cactus, Chrysanthemum, Grape Ivy, Swedish Ivy, Peace Lily, Philodendron, Poinsettia, Spider Plant, and any other moisture loving plant. Outer pot is fully glazed inside and out to protect furniture from leakage and sweating. Opening for plant is 4" in diameter