The present invention includes a reservoir on a base supported at an elevation by a support member above a plurality of plants to be watered. A mechanical fill assembly, containing a flush valve and a float connected to a water supply line, automatically keeps the reservoir filled with water for extended periods. The plants are watered by gravity through a plurality of main valves in the reservoir that provide a controlled amount of water to main lines extending to each group of plants. Branch lines extend from each main line that terminate at perforated plant lines at each plant to be watered. A plant valve controls the amount of water each plant will receive on a continuous basis. In a further embodiment of the invention, a bird porch is attached to the reservoir to automatically provided a bird waterer and to provide a bird feeder. Also, a removable fertilizer tray can be provided to fertilize the plants.