Use of rain sensors helps to prevent watering during or immediately following a rainfall. The best time to water is late night/early morning, finishing before sunrise.
Winds are lightest and temps are coolest, and there is already dew on the ground. This prevents waste and helps reduce the likelihood of disease development.
Deep, infrequent watering is ideal. It encourages a deep, drought-tolerant root system. Shallow, frequent watering creates a shallow root system that is particularly susceptible to drought.
If your lawn requires more, you may need irrigation system repairs or adjustments by a trained professional. ***The best way to determine run time to is have irrigation system evaluated by a professional