Watering Your Lawn
In the summertime, lawns generally require about 25 mm of water every week. Bluegrass however, does go dormant during dry seasons — the grass may turn brown, but will green up again when it is watered.
A good rule to follow is this: If you water, do it regularly. Apply 25 mm every week (including rain) at one setting of the sprinkler. Water evenly and slowly enough so that it penetrates without run off.
Too much water can be as harmful as not enough. Soil that is continually soaked does not allow air to reach the root zone where it’s required. Avoid frequent light waterings which result in shallow rooting.