- During a hot day, you should water your grass in the morning. According to Allaboutlawns.com, the best time to water your lawn is 5:00 a.m. This prevents excessive evaporation from taking place. The morning dew creates more moisture within the lawn. Watering your lawn during the morning will also allow it to dry off by nighttime. Watering your lawn during the evening can lead to lawn diseases, so regardless of temperature, always water your lawn during the early morning whenever possible.
- In the event that you have just applied fresh fertilizer to your lawn -- in particular, dry fertilizer -- water your lawn a few times throughout the day. This is especially true on hot days. Extra watering will help the fertilizer take hold as well as defend against burning. Fertilizer burn refers to the browning or dehydration of the grass and surrounding plants, which can eventually kill the vegetation. If the lawn itself is freshly planted, water it at least once a day for roughly two to eight weeks. This allows the seeds to germinate and provides a solid root system.
- Although it is generally better to water your lawn during the early morning, there is an exception to this rule. If the temperature during the day is going to carry into the night, then watering your lawn during the nighttime is acceptable. Check to see how hot it's going to be during the nighttime hours. If the temperature is going to stay above 68 degrees, you can either water your lawn in the morning or evening. However, avoid watering during midday on extremely hot days. The hotter the temperature, the faster evaporation will take place.
- Water thoroughly. A thorough watering allows water to seep into the roots, promoting a healthy lawn. However, if you have freshly seeded your lawn, do not water as thoroughly so that the top of the lawn remains moist. The same is true for newly sodded lawns. If your lawn is already established, only water it once on a hot day. Too much watering can lead to weed development, such as crabgrass.
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