Less means more and more means less… in lawn care, that is. Light, frequent watering of turf grasses produces a weak, shallow root system. This encourages weed invasion and does not allow effective use of soil nutrients or moisture. In contrast, deep, less frequent watering produces an extensive root system that efficiently utilizes the soil’s resources and is less susceptible to stress injury.
Most grasses take on a dull purplish cast and the leaf blades begin to roll or fold before they begin to wilt. Ideally, it is best to water any turf just before it begins to wilt. Early morning is the best time of day to water (late evening is the worst). If the grass shows these first signs of wilt in the morning, after having the night to recover moisture, then it is time to water. Water should be applied to a depth of four to six inches. Different types of soils require different amounts of water to achieve this depth. Sample the soil to see how much water is needed to achieve the desired depth.
John Kuster, fromer Smith County Master Gardener
Texas A&M AgriLife Extension Service