An irrigation apparatus provides water to one or more plants growing in a growing medium contained in a pot or tray. The irrigation apparatus includes a water container mounted to a base below the tray for vertical movement between an upper position and a lower position, in which the water container is urged toward the upper position. Also included is a water supply for supplying water to the water container, the water supply including a control valve having an open and a closed position for permitting and preventing flow of water into the water container, respectively, the control valve closes when the water container is in its lower position. The arrangement is such that when the water container contains water and is in its lower position, the surface of the water in the water container is at a predetermined distance below the underside of the tray supported on the base.