Abstract: An electronic timing system for controlling a plurality of electrically controlled watering valves comprising a free running multivibrator circuit having a plurality of individually adjustable resistor-capacitor circuits for controlling the frequency. A divide-by-N counter, when filled, controls a stepping counter for successively activating different ones of the valves and, in turn, selects different ones of the resistor-capacitor circuits to control the time each of the valves is activated. Operation of the multivibrator circuit is initiated by a clock operated day-of-the-week counter having pre-settable switch means for enabling or disabling operation of the multivibrator circuit during any selected day. A repeat cycling control device is provided to selectively cause repeated cycling for different numbers of times and a delay device is provided to delay repeat cycling for different time periods.