Eliminate the severe water stress that new trees endure after transplanting. This tree watering bag is designed specifically to increase first-year survival rate and set the stage for a long, healthy life. The Water Donut slowly empties out and only needs to be refilled one or two times per week for most trees. Installs easily in just five minutes, without tools. Made from heavy-duty, green-coated polypropylene that is U.V. stabilized to last after long hours in the sun. Safe to use with nutrient or chemical additives. 15 GAL.