1. What is the best time of day to water the lawn?
Early in the day is the best time to water, however if you can't water in the early morning, anytime is better than not watering at all. Watering early in the day allows for less evaporation and utilizes the most available moisture. Watering late in the day encourages the spread of certain lawn diseases. Most lawn fungus spreads during the moist, dark conditions overnight.
2. How much and how often should the lawn be watered?
It's always best to water the lawn deeply and less frequent. 2 or 3 times a week at a half inch per watering is best. Getting the water to the roots is vital to the plants health. Water the roots and not the leaves is the best thought.
Water is mainly lost to evaporation during light and frequent waterings.
3. How much water does a lawn need?
A lawn needs 1-1.5 inches of water per week. This is in combination of rainfall and watering. Having a rain or watering gauge in the lawn to monitor is very helpful. Using a watering gauge can prevent unnecessary watering during the summer.
Watering longer is a better bargain.
Watering daily for 6 mins (42 mins a week).
90% of the water never reaches the root zone and most is lost to evaporation.
Watering for 20 mins 2 times a week (40 mins a week)
Will cost you the same amount in usage but is far more beneficial for your lawn.