Water is an essential element to your landscape. However, too much or too little can harm your lawn.   ·    Early morning is best to water most lawns. ·    Watering your lawn after 10 AM, much of your water will be wasted due to evaporation. ·    Running your sprinkler at night sets ideal conditions for lawn disease, mildew, fungus and insect problems. You want deep, infrequent watering that gets to the root zone. One (1) inch per week is an ideal rule.