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Squash Leaves Turning Yellow: Causes & Fixes

Considering the fact that any of you found yourself in this article, I am well aware of the fact that you either plan on planting squashes, own squashes, or squashes are your favorite vegetables! Well, I wouldn’t blame you in any way, as they are definitely the most preferable veggies for many people all around the world.

However, growing squash plants in the garden go through different things and “tough times” and one of them is squash leaves turning yellow! I am pretty sure that some of you have dealt with it, but right now, in this article, I will try and tell the “newbies” in the world of gardening, the main things that bring the yellowing of leaves in a squash plant! You will also be able to find ways on how you can prevent this issue, only if you stick until the end of this article!

Without further ado, let us go through squash leaves turning yellow!

Why Are My Squashe’s Leaves Turning Yellow?

Somehow mentioned above, the yellow leaves on squashes happen because of something, and there is not only one reason but a few of them. As the main reasons that are included in this “bad procedure” are watering issues, lighting conditions, lack of nutrients, pest infestation, and some viruses that your squash plant can have.

I would like to go into more detail about them so that you can understand them better!


When I mention water, you should immediately think about overwatering and underwatering, but when it comes to the yellow leaves on a squash plant, the overwatering part is one step further than the underwatering one. Underwater is mostly shown when the soil in which you have the quashes planted is super-dry, meanwhile, the overwatering issue on these plants is shown on the leaves.

They start with small yellow spots, and if a lot of time passes, you will notice that all the leaves turn yellow, all at the same time.


Light is one of the most important factors that help in the growth of squash plants, and if the plant hasn’t got the need all fulfilled, the leaves turn yellow quicker than you can ever imagine.

It is essential for the squash plants to have the light that they require because in the end, they can fully die because of the lack of light.


Besides water and light, squash plants love nutrients as well, and when not having them as they should be, first thing first the yellow spots appear on the edges of the leaves and then move on to yellowing the leaves completely. Besides becoming yellow, the leaves dry a lot as well, and they have a super-weird shrinking look.


Another super-common problem that squash plants deal with is the pests or insects that may surround the plant completely. Considering that these plants grow in the ground soil mostly, pests can find a quicker way on entering the surface of the soil, and once there, the yellowing of the leaves starts immediately from the leaves that are nearby the ground.

It is worth mentioning that squash plant leaves can get yellow because of viruses as well, but still, there is no exact information on what types of viruses appear on these plants. 

How to Prevent Squash Leaves From Turning Yellow?

Every reason or every cause has its solution, and here, in this section, I will mention some of the important things that you can do properly, in order to not deal with yellow leaves on a squash plant. They go as follows:

Proper Watering

A squash plant has its water needs, and in order to not go and overwater it, is important to know that these plants require one inch of water per week.

Exact Lighting

As I mentioned above, these plants need light as much as they need the soil. However, it is said that a squash plant needs exactly 6 hours of sunlight per day, and it definitely should be direct sunlight.

Having more than six hours of direct sunlight doesn’t cause as much damage as having less.

Fulfill the Need for Nutrients

Nutrients are basically the food that different plants require from you, and food in plants is considered some different chemical substances. In order to feed the squash plant properly, you should have in mind that they need nitrogen, phosphorus, and potassium. All of them should be at 4%.

Take Care of Pests

Dealing with pests is one of the most annoying things that one can do, and it has its ways as well. In order to completely clean a squash plant from pests, you should move the plant entirely at a new soil. If you remember the things that I mentioned above regarding the lighting condition, I bet that it will be a better job.

Final Words

Here we came at the end of this article! I think that it was clear enough that a squash plant’s needs are mostly related to water, light, and nutrients. However, that doesn’t mean that the other things mentioned cannot cause yellow leaves on them. The thing that is important is to have in mind the things that you can do, in order to prevent this issue.

I really hope that this article will help those in need, in order to take care of squash leaves turning yellow!

Further Reading

Mentioning some other articles where you can get informational content is my thing as well! In this case, I cannot leave without adding some of them!

Yellowing of leaves not only happens in squash plants, but it is also an issue through which many plants go. As an example, I would like to mention money tree leaves turning yellow, as well as the reasons why Mandevilla leaves turn yellow.

Now, besides the yellowing of leaves, brown ones are also worth mentioning. You can find out more about leaves turning brown if you have Japanese maple leaves turning brown, and the causes and fixes of hydrangea leaves turning brown!

Check the articles out and stay tuned for some more!

Natalia Michalska

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