What is one reason midday watering of lawns in the summer is usually not recommended?

Midday watering of lawns in the summer is not recommended primarily because much of the water is lost through evaporation. During the heat of midday, temperatures are at their highest, and the sun's intensity leads to rapid evaporation rates. When water is applied to the lawn during this time, a significant portion can evaporate before it has a chance to soak into the soil and reach the plant roots. This not only wastes water but can also mean that the plants do not receive the moisture they need to thrive.

In contrast, watering either early in the morning or later in the evening allows for better absorption by the soil, as temperatures are cooler, and evaporation rates are significantly lower. This practice promotes healthier lawn growth and conserves water resources by maximizing the efficacy of irrigation efforts.