For healthy Fescue and bluegrass turf, deep and infrequent watering maintains a healthy root system and reduces weed infestations. Applying 1 – 1.5 inches of water per week is often difficult to achieve in a single watering. Therefore, smaller amounts of water applied every other day, no more than 2-3 days a week, is recommended to allow water to soak into the soil without causing runoff. To measure the amount of water being applied, place several flat bottom pie plates or cans (tuna cans work well) around the lawn.
These should all catch the same amount, indicating even watering coverage. Watering ½ to ¾ of an inch, 2-3 times per week, is generally sufficient. In times of excessive drought, higher amounts of water may be needed to keep fescue or bluegrass from going dormant. Do not water every day as this causes turf grass plants to have a shallow root system. A good schedule would be Monday and Thursday for a 2-day schedule, or Monday, Wednesday, and Friday for a 3-day schedule. Water between the hours of 4 AM – 7 AM when evaporation loss is lowest and temperatures are the coolest.