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Is 4 Inches Too Tall For Grass? See Gardeners Answer!

by Jack Grover
Reading time: 7 min Prefer to listen?

Ever wondered what is the ideal height to cut the grass on your lawn? Although the best length of the grass depends on climate and grass type, as per most experts the length should be 2 ½ – 3 inches.

That said many people also ask is 4 inches too tall for grass? No, 4 inches of grass is not considered too tall for your lawn. According to some experts, the lawn should be mowed 3.5 to 4 inches. However, you should not let your grass grow taller than this.

If you are still confused, continue reading the whole article to get a deep insight into this query.

Is 4 Inches Too Tall for Grass?

There is no denying that how you mow determines the appearance and health of your entire lawn. But have you ever thought about what height setting should I cut my grass?

Many people make a very common mistake of mowing too short. You should always try to mow at a height between 2 ½ to 3 inches according to a University of Illinois extension. If you are mowing in the summer, you should bring the grass to 3 inches.

Typically, if you mow at a higher length, you will face fewer issues with weed. Besides, the roots will be deeper and your lawn will appear beautiful. You should always cut only one-third of the leaf at a single mowing session.

There is a scientific explanation for this. According to a study from University of California when you mow grasses, their overall rate of photosynthesis is reduced. Besides, there will be higher turf stress. So, to minimize the damage to the grass, 2/3 of the original length should not be removed.

That said, 4 inches is not too tall for grass. Because if you remove 1/3 of the 4 inches, more than 2 ½ inches of the grass heights will remain. I already mentioned that 2 ½ to 3 inches is the optimum length you should bring your grass after each mowing session.

Why You Shouldn’t Allow Your Grass to Grow Too Longer

If you allow your grass to grow too long, it is not a wise decision at all. Because in most cases, grasses that grow beyond 4 inches, may create several types of problems. But, the problem is most lawn owners become confused about what length should be considered too long.

Before digging further, you should know what is the best height to cut your lawn at. Although several factors contribute to this decision-making, as per experts, you should mow your grasses when they are at 3.5-4 inches in height.

So, it can be said that 4 inches are not too tall for grass. But, beyond this measurement can be problematic. Typically, grasses beyond this limit can’t hold themselves up easily. As a result, it tends to drop into the surrounding grass.

Due to the dropping of the longer grasses, moisture will also be trapped in lower areas. That’s how fungus and other kinds of diseases can spread on your lawn. So, it is wise to stop the growth of your grasses beyond 3-4 inches in height.

You Can Check This Video For Further Understanding

Frequently Asked Questions (FAQs)

Are 4 inches too high for grass?

No, 4 inches is not too high for grass when it comes to mowing. According to the rules of thumb, you should cut ½ of the original height for optimum lawn mowing. So, if you don’t remove 2/3 of the 4 inches tall grasses, you will achieve the optimum length. But, grasses taller than 4 inches are considered too long.

What is the best height to mow your lawn?

The best height for lawn mowing depends on several factors. For instance, the climate of your region and the type of grass play an important role here. However, after considering everything, it can be said that 3.5-4 inches can be the ideal height to mow your lawn.

How tall is too tall for the lawn?

As per the expert’s guideline, you should mow one-third of the grass’s height at a single time. Again, the optimum grass height after mowing should be 2 ½ inches to 3 inches. After considering both of the above statements it can be said that the grass taller than 4 inches can be considered too long.


Mowing is a regular practice that will make your lawn healthy and beautiful. But, many people are confused about how often they should cut the grass. So, is 4 inches too tall for grass when it comes to lawn mowing? In our opinion, you should not consider 4 inches too long.

In this article, we tried to explain why you should consider 4 inches as a normal height for your grass. We hope it was helpful, and now you know how often you need to mow your lawn. We always wish you a healthy and refreshing lawn.

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