3. efficient irrigation: xeriscape can be irrigated efficiently by hand or with an automatic sprinkler system. zone turf areas separately from other plants and use the irrigation method that waters the plants in each area most efficiently. for grass, use gear-driven rotors or rotary spray nozzles that have larger droplets and low angles to avoid wind drift. spray, drip line or bubbler emitters are most efficient for watering trees, shrubs, flowers and groundcovers.