Zoysia needs 1/2 to 1 inch of water per week in the form of rain or irrigation, depending on location and weather. Look for withering, drying leaves and poor recovery from foot traffic to know when zoysia needs more water.
Watering in the morning reduces moisture lost to evaporation. Deep, infrequent watering works better than light, daily watering, as it encourages deep root growth which results in stronger, healthier turf.
Watering frequency varies by soil type. For example, zoysia planted in sandy soil needs 1/2 inch of water every two to three days. Water to a depth of 4 to 6 inches each time. It takes about three to five hours to apply the recommended 1 inch of water every week, according to North Carolina Cooperative Extension.