5 Reasons for Cucumber Leaves Curling [Fixing Guide]

Who doesn’t love a juicy and fresh bite into a cucumber, right? But, have you ever considered growing it at your home? If you already do and you are experiencing the cucumber leaves curling, chances are that there could be a series of potential reasons behind it.

Cucumber Leaves Curling

It could be due to excessive heat, lack of soil quality, lack of water, or even due to a pest attack. The possibilities are quite extensive and to mitigate the issue, you need to understand what’s causing it in the first place.

We’ll look into all the possible answers in detail in this guide. So, let’s get on with the article.

Why are the Cucumber Leaves Curling?

When you notice the curling of the cucumber plant’s leaves, it is an early sign that something is potentially wrong and inducing stress to the plant. In such cases, we’d recommend you find the cause and then mitigate the issue accordingly.

Here’s what you can do:

1. Water Stress 

Now, what even is water stress? Excessive or underwatering of the cucumber plants can lead to the leaves curling. This means that if you are unwatering the plant, especially the baby plants which don’t have a very strong and profound root system, the same will end up hampering the plant’s overall growth.

Water Stress 

Similarly, overwatering the cucumber plant leads to risks of root rots and other complications related to nutrient uptake which led to the issues of the leaves curling in the plant. Ideally, you have to water a cucumber plant more than standard. It requires 3-4 times watering each week, depending on the moisture level of the soil.

How to fix it?

Buy a moisture meter for the soil. This will assess the soil’s moisture level and effectively get rid of the issues that are potentially contributing to the water stress. Also, you can take the manual route and check the soil’s wetness on your hand. If you notice that the soil is wet, avoid watering. If you notice the soil is dry, it’s time to water.

2. Nutrient deficiency

Plants need a balanced nutrient uptake from the soil to grow optimally and without any issues. If the cucumber plant isn’t getting its share of nutrients from the soil, the same can end up affecting the growth and lead to the curling of the leaves. This is very common if you don’t use potent and good-quality slow-releasing fertilizers in the soil.

Nutrient deficiency

Ideally, you want to look into the degree of curling. If it is spreading quickly and affecting the nearby leaves, it is likely due to nutrient deficiency in the soil. Sometimes, a certain degree of change to the soil’s pH also affects the plant.

How to fix it?

Cucumbers need a good amount of nitrogen throughout their growth cycle. So, your first step is to get a well-balanced fertilizer that will contribute to the optimal growth of the plant. Slow-releasing fertilizers are pretty great too. Sometimes, a mix of Epsom salt in the mix also helps in combating the nutrient deficiency proactively.

3. Environmental Stress

Too much of anything is bad for us, right? The same applies to the cucumber plant as well since it doesn’t do well under prolonged and persistent sunlight exposure. Also, excessive heat and humidity in the surroundings can end up affecting the plant’s growth. If there is excessive heat in the environment, the same can leave to evaporation, which leads to the leaves curling.

Environmental Stress

Also, if you indulge in heavy pruning, that is another potential reason that could be contributing to the leaves curling, so ensure that you are aware of these complications.

How to fix it?

When growing cucumber plants, you need to aim for up to 7 hours of sunlight. Anything more than that will end up affecting the growth, making the leaves curl because they need to conserve the water that just evaporated. So, be cautious of these factors.

4. Aphid Attack

Cucumber plants are generally quite resilient to pests and insects until it comes to aphids. Those are one of the worst of the lot and will affect the growth of the plant and lead to discoloration in the leaves along with curling. Aphids infest the plant in larger amounts, which might end up affecting the plant’s vitality too.

Aphid Attack

If you notice the plant’s leaves having holes in them, that’s one of the most common signs of an aphid attack. Also, if you are checking for an infestation, we’d recommend that you look at the underside of the leaves since that’s where the pest generally stays. 

How to fix it?

Your first step is to look for the signs of infestation. You need to ascertain that it’s an aphid infestation before you take any further steps. Ideally, we’d recommend using a water hose and spraying it on the plant. This will wash away the aphids that are stuck on the plant. Follow this up with some insecticide.

5. Diseases

Common viral and fungal diseases could be reasons why your cucumber leaves are curling from the ends or sides. A common issue with the cucumber mosaic virus also ends up causing discoloration on the leaves, further leading to the yellow or wrinkled appearance that you witness around. Also, mildew is a common issue when the humidity is high.


If left without treatment, the mildew will spread very rapidly and end up affecting the plant’s growth in the long run.

How to fix it?

Since pests are the common vectors of all these viral and fungal diseases, your first step is to look for the pests. You can spray the plant with some pesticides as the first line of treatment. If things don’t recover, use fungicides to eliminate the mildew from the plant.


Cucumber leaves curling is a serious matter that every gardener should be aware of. However, you need to realize that the easiest way to mitigate the issue is by understanding the causes first. If you don’t realize the cause, implementing the solutions can be quite difficult in the long run.  

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