The District set the watering hours in 1991 as part of its water conservation rule , a rule designed to use water in the most efficient manner. When you water your lawn or landscape before 10 a.m. or after 4 p.m., evaporation is lower so the water can seep into the ground where it's available for thirsty grass and plant roots, promoting healthy plants that establish deep root systems. Water droplets on plants can act like a magnifying glass, causing the sun to burn the leaves. Though Florida usually receives about 50 inches of rain each year, only a small amount seeps into the ground to replenish underground aquifers. Tips for a healthy lawn Do not overfertilize.
Fertilizers stimulate growth and increase water needs.
If you do fertilize, use a slow-release nitrogen product. Raise the height of your lawnmower blades. When you mow, remove only the top one-third of the grass. Cutting grass shorter than that decreases the depth to which roots will grow, increasing their need for water. Most St. Augustine and bahia grasses should not be mowed shorter than three inches in height.