Why Does Grass Turn Yellow After Cutting It?

Yellow grass in lawn

Mowing your lawn puts a strain on its health and can even cause catastrophic damage. The presence of yellowing grass in the trail of your lawnmower could indicate underlying issues with your lawn’s health. This yellowness appears when you mow too much of the grass in one sitting. When it comes to mowing, the basic guideline is that you should never remove more than one-third of the grass in a single pass.

The rule of thirds is a term used by many lawn care enthusiasts. To put it another way, if your grass is three inches long, you should only trim one inch off. If it’s 7 inches long, you should just cut off about 2 inches. In this article, we will be talking about why does grass turns yellow after cutting it.

Why Does Grass Look Yellow After mowing It?

1. Improper mowing

The sheaths of the grass should never be cut by the lawnmower. Mowing at the proper height prevents the yellowy sheaths from being exposed by removing too much green leaf blade.

During mowing, never remove more than one-third of the overall grass height. For example, if you want a 3-inch-high lawn after mowing, mow it when it reaches no more than 4-inches in height. If your grass gets out of hand and becomes tall, don’t cut it too short, as this exposes the sheath and eliminates the green sections of the leaf blades.

2. Lawnmower blades

When you use the blade regularly, the blade’s efficiency decreases. When the blades aren’t sharp enough, they tear the grass rather than cut it. As a result, we will not obtain the desired outcome. When grass is cut off, it tends to turn yellow within a short period.

The best method is to keep an eye on your lawn mower’s blade sharpness. As a result, the simplest solution is to sharpen the lawnmower blade with mower blade sharpening equipment. When you’re done using it, check the blade of your lawnmower. Check if t’s in good shape for the next mowing day.

3. Under the sod

Low-quality soil that drains too quickly or contains too little water might also cause your grass to turn yellow after you mow it. Spots of sandy soil drain faster than the surrounding soil, making your grass more susceptible to mowing stress.

To enhance the soil’s water retention, incorporate organic mulch or compost into the upper layers of the soil, or water those areas more frequently to compensate for the quick water loss. Buried debris can also reduce the amount of soil available to your grass’s root system, resulting in small patches of the yellow lawn when mowed. To solve this issue, dethatch the lawn at least once a year.

4. Scorching weather

Your grass loses a lot of water in the summer. Part of this is because it has to release moisture through evapotranspiration to stay cool and maintain its internal processes. This could indicate that your lawn’s root system is shallow.

You can water your lawn to restore color, but to address the base of the problem and limit the likelihood of it happening again, you’ll need to encourage your grass to root deeply. To achieve this, water deeply and infrequently. When grass is already stressed, cutting it might exacerbate the problem, resulting in yellow tips. Make up for it by lifting your mowing deck and/or mowing less regularly while the weather is becoming colder.

5. Plant stress

Dry soil or sunscald could also be the cause of peaked and yellow grass after mowing. The grass plants’ lower section and the soil are shaded by the green leaf blades, which photosynthesize light. When the blades are cut off, the less green regions of the leaf blade and sheath are exposed, causing withering and yellowing.

Parts of the grass may appear less green than usual if the soil is poor in nitrogen. As a result, the lawn grass will not grow as quickly or thickly, resulting in a yellow appearance.

6. Underfertilization

People who don’t have enough time to care for their lawn and who aren’t in excellent financial status are often the ones who are most affected. As a result, their lawn requires special attention because it lacks the necessary nutrition for their bodies.

If your lawn is also getting yellow with this disease, you have to use a good fertilizer. It will assist you in restoring your lawn to the light green color you desired after mowing it. However, while using fertilizer, always follow the manufacturer’s directions.


Can yellow grass turn green again?

Yes. If your grass is yellow due to soil issues, you can treat the soil with compost. It can help with issues like poor drainage and maintaining adequate pH levels. Fertilizer can also aid in the restoration of a yellow lawn. A good fertilizer product can replace nutrients such as nitrogen that are deficient in the soil.

Does too much water make grass turn yellow?

You’re probably aware of the negative consequences of insufficient irrigation, but grass that is overwatered is also bad for the grass. Overwatering the lawn can generate yellow or barren spots by drowning the grass plants. Start repairing an overwatered lawn as soon as possible if you were overly liberal with water.

Is yellow grass dead or dormant?

Tugging on the grass plants is one way to tell if it’s dormant or dead. If the plants easily pull out from the earth, they’re most likely dead. The plants are dormant if the roots retain firm when pulled.

Get Rid of Yellow Grass

Having a yard around your home, whether you own it or rent it, provides you with a natural area to enjoy. It’s a lovely thing to have, whether it’s just something to gaze at out the window or a place your family and friends appreciate.

Whether your grass is a warm-season or cool-season variant, cutting and mowing it is an essential part of it all. If you want deep-green grass, you’ll need fertile soil with plenty of moisture, traces of iron, and plenty of nitrogen.

These yellow lawn patches emerge after you have cut too much grass in one sitting. To avoid this, detach your grass and mow it on a higher setting regularly. Trust me, your grass will look much healthier as a result. If the yellowing persists, you might consider using a lawn fertilizer, as the soil may be deficient in critical elements like nitrogen.