If your plants are showing signs of water stress in the middle of the day, by all means you should water them! Postponing irrigation until the evening or the following morning could damage your sod and in extreme heat, it may not bounce back. edu web sites dispel this myth, hundreds of other domains on the web keep the misinformation alive. This is one of those myths that refuses to die. This all sounds very plausible (it has the patina of physics, after all) and there is anecdotal evidence that seems to support a cause-and-effect relationship between midday watering and leaf dieback. Furthermore, we’re told that since water efficiently conducts heat, wet leaf surfaces are more likely to burn than dry ones. The myth is as follows: if sod (or plants) are watered while the sun is shining, water drops that accumulate on the leaf surfaces act as tiny magnifying glasses, focusing the sun’s energy into intense beams that burn leaves. The Myth of Hot-Weather Watering “Watering plants on a hot sunny day will scorch their leaves” Linda Chalker-Scott, Ph.D., Extension Horticulturist and Associate Professor, Puyallup Research and Extension Center, Washington State University wrote: However, water cannot cause leaf scorch - meaning it’s time to put the magnifying glass theory to bed. The idea behind this is that water droplets act as magnifying glasses, focusing the sun’s energy and burning the blades of grass or leaves underneath. When summer heat hits, many worry about watering their lawns when the sun is shining.
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