Grass certainly needs regular waterings (whether from you or Mother Nature), but on the other hand, overwatering can be dangerous because it
I Deprives the roots of needed oxygen
I Causes wasteful runoff, sometimes carrying soil and fertilizer with it I Destroys soil structure I Encourages disease activity
When you do water, how much water to use is something you figure out on the job. I have no universal answer here, because so much depends on the type of grass, the setting, the type of soil, and your climate (including how often it rains). However, a general rule is between 1 and 134 inches per week. Water more when the weather's hot and less when it's cool. The object is to wet the entire root zone but not saturate it. This concept is especially true on heavy clay or loamy soil (rich soil with mixed particles).
After you successfully wet the entire root zone, observe how fast the lawn absorbs the water so you know how often to water. Generally, you want to let the soil dry out between waterings. Shallow-rooted grasses, naturally, get thirsty again sooner than deep-rooted ones. It's in your best interest (less work for you; a healthier lawn — win-win, as lawyers are fond of saying!) to encourage deeper root growth by not underwatering. Once or twice a week should do the trick.
Frequently cut, shorter grasses dry out faster than ones that you let grow a little taller between mowings.
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