Abstract: Apparatus and method for automatically irrigating and fertilizing a plurality of zones in a lawn and other botanical systems. A conventional underground sprinkler system may be employed having a source of liquefied fertilizer to be inserted into the main water supply or any of the zonal lines when water is being delivered to one of the zones. A clock is used to establish a maximum duration of fertilizer delivery. Normalizing timers are employed to restrict the flow of fertilizer as a fraction of the maximum duration depending on which zone is being irrigated.