Install this watering system prior to filling your U-Garden with planting mix and you'll need to water your plants less often. In our test gardens we watered 60% less often, compared to a U-Garden without the watering system. The 5-gallon reservoir helps plants get a steady supply of water through contact with the soil, as well as through evaporation. When it’s time to fill the reservoir, attach your garden hose and in just a few minutes the soaker hose fills the reservoir. The reservoir also captures and stores rainwater, while allowing excess water to drain. Fits both the Rolling U-Garden and Elevated Rolling U-Garden.