Moderation is the key so too little water can be as bad as too much.
If augmenting Mother Nature be sure to apply about an inch of water twice per week.
Plan on watering for about 15-30 minutes to apply an inch.
Be careful – sprinklers dispense water at different rates and in an uneven pattern.
Measure application rates per unit of time by placing shallow containers in the watered area. After 30 minutes retrieve the cans and see how much water has been accumulated. Reach a depth of one inch you’ll have a good idea of the required watering duration.
Watering - What's the Best Time of Day to Water?
Running the sprinkler all night sets up perfect conditions for fungal disease to grow.
As summer temperatures and humidity combine to a total of 150 conditions are ideal for disease.
Rule of Thumb – Don’t water after 10:00 AM.
But if the situation demands schedule the sprinkler for 4-7 PM. In the hot afternoon, much of your water can be lost to wind enhanced evaporation.
Reside in the dry southwest water in the evening or night to reduce evaporation.
If not given opportunity to dry the lawn becomes a place where fungal diseases can thrive.
Grasses: Going Dormant Is Normal
During prolonged drought cool-season turf becomes dormant and turns brown.
Dormancy enables energy conservation-enabling survival during drought.
In a dormant state the plant will survive for periods of up to 2 months.
When dormant it is important to keep foot traffic to a bare minimum.
Cool-season turf is resilient and will revive when rainfall and cooler temperatures return.
Warm-season grasses also enter into a dormant state - but in the late fall and winter.
Dormancy is not "death" but simply a time when the plant is "resting", a means of the plant coping with unfavorable weather.
Once favorable condition return the plant will come out of its "sleep" and with proper care return to its previous green state.