This self watering reservoir allows you to enjoy the beautifully lush plants you've always wanted but without the hassles and time commitments of most window boxes and conventional gardens. Refill it once and enjoy up to two weeks of automatic watering without having to lift a finger. This reservoir can be placed in a wide range of planters up to 30". It keeps a consistent moisture level within the soil, providing ample nourishment and moisture to the roots at all times, even if you haven't watered them that day. It also helps prevent root rot and other damage related to rainfall, with no risk of overwatering. It's an ideal solution for those who travel frequently, for individuals who don't have time for daily watering, for beginning gardeners who are just getting the hang of growing plants, or for anyone who wants to spend more time enjoying their plants and less time watering them. Instead of watering over the top of the soil, the fill tube allows you to supply water directly to plant roots, where they draw it up through the soil through capillary action, or wicking. This further hydrates the grow medium or soil for the plant roots to drink from.