Does watering grass in sun kill it?

by Qarah Ict Qarah ICT

One of the frequent lawn maintenance myths is that watering grass in the sun can kill it. Although the science behind this concept seems reasonable, this is a common misconception. Many homeowners are under the impression that water droplets on grass can refract light, increasing the sun's intensity to the point where it kills the grass.

In this article, I will seek to answer a specific question that many people who care for lawns commonly have: "Does watering grass in sun kill it?"

No, watering grass in sun will not kill it. Watering your lawn on a sunny day will not kill the grass, regardless of how intense the sunlight is. However, for general watering purposes, watering grass in sun is not ideal; you will lose much of the water to evaporation before your grass can take it up. Even so, your lawn may benefit from extra watering during the day if conditions are scorching and dry.

Many homeowners believe watering grass under bright direct sunlight can kill the grass. The advanced logic to this belief is that, under direct sunlight, water droplets have a reflective effect; many believe that water can intensify the sun's rays to the point where they can kill the underlying grass blades. However, research shows that this belief is entirely false.

Scientifically speaking, it is technically accurate that water can refract and magnify heat and light. The water droplets on grass blades will not significantly amplify the sun's energy to the point that it can kill the grass. But, for the light to be intense enough to kill the grass, it would be necessary for the water droplets to be a bit far away from the blades. In other words, the droplets would only be able to kill the grass if they were somehow suspended in the air.

It's therefore impossible to kill the grass by watering it, regardless of the time of day or height of the sun. With that said, many other agents in water can cause the grass to appear killed; substances like salt, chlorine and excess fertilizer are all moved by water and can kill your grass. Observing yellow or brown patches on your lawn could indicate other issues like drought, fungal disease, or pests.

As I've just explained, there is no possible way to kill the grass simply by watering it. It is okay to water grass in the sun. And your grass could greatly benefit from extra watering on a hot or bright day.

On sunny days, the soil in your lawn will quickly lose moisture to evaporation as the sun becomes progressively more intense. Provided you have mature grass with healthy and extensive roots; your lawn will tolerate these temporary periods of drought; the grass should stay green as long as you keep up with a sufficient watering schedule throughout the week. Adding extra water on days when the sun is exceptionally bright will still benefit your lawn.

If you water the grass at night, it doesn't get to evaporate off the leaves, and a cold, wet lawn can grow mushrooms, fungus, and mold which is the opposite and accurate. You avoid watering your lawn at night,

For optimal lawn health, you want the ground to be wet and the leaves to be dry. The best way to attain this is to water in the morning.

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