Dew Right Tree Watering Bag is made of heavy duty green coated polyethylene with UV stabilization, nylon webbing, poly straps, and black nylon zippers The Dew Right Tree. Watering Bag has micro-perforated release points along the bottom seams for a slow release of water. Safe to use with nutrient or chemical additives, the bag needs to be filled 1-2 times per week for most trees. Zip together 2 bags for trees 3”-5” caliper to hold 30 gallons.