Durable: Made of strong PVC which can naturally resist UV, muted colors and colors blend with the landscape, reduces ibility during use, specially designed PVC filler cap and locking cap Slow release: slow release wax irrigation bag. This slowly releases water into your soil directly around the tree where it can be easily obtained by the roots and surrounding soil for complete coverage. Large capacity: 15 gallon capacity per bag can release water about 1-6 hours for deep saturation. Applications: Perfect for watering newly planted trees, evergreens, shade and ornamental trees, as well as large shrubs with branches at least 6 inches from the ground or higher, promotes deep root growth. Easy to use: Convenience allows for easy filling, simply place bag on flat ground around the truck of a new tree or shrub, filling via pipe, hose or other suitable way, no need for special tools, leave after filling, automatic watering to save your efforts< /p>