Leonard ArborRain Towers make it easy to ensure your young trees have the perfect amount of water they need to thrive. A.M. Leonard makes these bags using a durable, green plastic material. Each tower holds approximately 20 gallons of water. A large opening makes them very easy to fill. One bag fits a tree up to 4 inches in diameter. Thanks to the built-in zipper, you can connect multiple towers for larger diameter trees. ArborRain Towers also feature sturdy, triple-stitched handles. ArborRain Towers deliver water directly to the roots of your plants. Each bag provides 5 to 8 hours of drip time. They are ideal for trees on flat or sloped surfaces or those grown in nurseries. They also work well on trees grown in containers. The green color blends into your landscaping, so they do their job without being an eyesore. A few features make Leonard ArborRain Towers better than the competition. The black inner lining prevents the growth of mold within the bag, keeping the drainage holes clear and the water flowing. The locking zippers allow the bags to stand up to the increased weight of the water. This strength is especially important when connecting multiple bags. The ArborRain Tower also features a sealed bottom instead of a stitched bottom. Inferior stitched bottom edges deliver water too quickly for the plant?s roots to draw it in, causing runoff. The sealed base of the ArborRain Tower provides the perfect amount of water to the plant. Professionals have long trusted Leonard ArborRain Towers for their newly-planted trees. Their combination of durability and effectiveness makes them the perfect choice for home growers as well. A.M. Leonard even covers them with a 5-year warranty! This product is not a free-standing unit. The tree supports the weight of the filled bag. We do not recommend using it for trees less than one inch in diameter.