A deep watering will get the water into the root system so that it will be able to take up enough water to counterbalance what the leaves give off. For best results, you can cut off the side of a plastic gallon jug and place the cut side touching the ground. Then stick the hose through the top where the lid screws on and let the water run for 10 15 minutes. Alternately, you can use a soaker hose placed around the drip line, dripping the water slowly every week throughout the balance of the summer and early fall.