Abstract: A method and apparatus for automatically watering and moderating the ambient temperature of a plurality of potted plants. Each plant is placed in an inner pot which is positioned within a larger outer pot. Each inner pot has an aperture in its bottom surface with a nozzle extending therethrough. Apparatus is placed in the bottom of each outer pot and cooperates with the nozzle to selectively prevent water flow into the inner pot when soil in the inner pot contains a preselected amount of moisture. Each outer pot is coupled to a water source through a respective water line. Water is admitted into the outer pots until the water level reaches a preselected level to regulate the amount of water admitted to the inner pot. For temperature moderation, controlled temperature water may be selectively admitted into and discharged from the water lines to the plants to maintain the temperature of water in the water lines at a preselected value.