Is 4 inches tall enough for grass? Gardeners Respond!

Have you ever pondered the question of how short your grass should be cut? Although the ideal grass length varies with climate and grass type, most authorities agree that it’s between 2 1/2 and 3 inches.

However, many people wonder if grass that’s four inches tall is a problem. You shouldn’t worry that your lawn is too tall if the grass is 4 inches tall. Some authorities recommend a mowing height of 3.5 to 4 inches for a healthy lawn. But don’t let the grass get any taller than this!

Do yourself a favor and read on to gain some clarity on this topic if you’re still perplexed.

Is 4 inches tall enough for grass?

There’s no denying that your lawn’s overall appearance and health depend on how you mow it. What about the question of How high I should set the blade on the lawnmower?

Commonly, people will mow their lawns too short. According to a University of Illinois extension, the ideal mowing height is between 2 1/2 and 3 inches. In the summer, the ideal height for cut grass is three inches.

Usually, weed problems diminish as mowing height increases. Moreover, the lawn will have deeper roots and a more aesthetically pleasing appearance. You should never mow more than a third of a leaf at a time.

This phenomenon has a rational scientific basis. University of California researchers found that mowing grasses significantly decreased their photosynthesis rate. Furthermore, turf stress will be increased. If you want to keep the grass in good condition, you shouldn’t cut it shorter than a third of its original length.

The grass can get a little taller, but not much more than 4 inches. Because if you cut away a third of the 4 inches, you’ll still have a grass height of over 2 12 inches. After each mowing, your grass should be between 2 1/2 and 3 inches in length, as I’ve already mentioned.

Why You Shouldn’t Let Your Grass Keep Growing

It is not a good idea to let your grass get too long. It’s important to keep an eye on your grass’s height, as anything over 4 inches can cause a host of issues. But the issue is that most homeowners don’t know how long is too long when it comes to their lawn.

The optimal cutting height for your lawn is something you should be aware of before going any further. Experts recommend mowing your grass when it is between 3.5 and 4 inches in height, but this decision is complicated by a number of factors.

Grass heights of 4 inches, then, are not excessive. The problem arises, however, when this threshold is exceeded. Grass species that grow taller than this usually struggle to maintain their own stability. Because of this, it frequently falls into the grass below.

When the taller grasses die off, they trap rainwater near the ground. That’s how diseases like fungus can quickly spread across your lawn. For this reason, once your grasses reach a height of 3 to 4 inches, it is best to cut them back.

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Frequently Asked Questions (FAQs)

Is a height of four inches too much for grass?

Grass height of 4 inches is not excessive and can be easily maintained. As a general rule of thumb, when mowing a lawn, you should aim for a height of about half the original height. The ideal length is achieved by leaving 2/3 of the grasses that are 4 inches or taller alone. However, grasses that are 4 inches or higher are deemed unacceptably long.

How short should grass be cut?

There are many variables to consider when determining the ideal cutting height for a lawn. For instance, factors including regional climate and grass type are significant here. Still, when all factors are taken into account, a mowing height of 3.5–4 inches emerges as a possible sweet spot.

What height is too high for the lawn?

The rule of thumb from the pro is to cut the grass down by a third at a time. Again, after mowing, the ideal grass height is between 2.5 and 3 inches. By combining the two arguments above, we can conclude that grass that is four inches or taller is excessive.


Regular mowing is one of the best things you can do for the health and appearance of your lawn. The question of how frequently one should cut the grass, however, remains a source of consternation for many. Is grass that’s 4 inches tall too much to mow? We don’t think 4 inches is too long at all.

With this piece, we aimed to make the case for why a grass height of 4 inches is acceptable. The frequency with which your lawn should be mowed is now known, and we hope this was of assistance. We hope that your lawn is always green and refreshing.