Why Cucumber Leaves are turning Yellow? – How to fix them? 

I was struggling with my cucumber plants. You know what? My cucumber plant leaves were turning yellow. I think many of you must have faced this problem. And now, I have found the solution. Eager to know what it is? Just be patient—you’ll get the answer.

This is one of the most common problems that gardeners face, but after reading this informative guide, all your problems will be solved. Let’s not waste time and see what I have discovered.

I’m here to share solutions for preventing cucumber leaves from turning yellow. I’ve explained all the various reasons and solutions to help your cucumber plants thrive. Without further ado, let’s save our cucumber plants.

Quick takeaways:

  • Cucumbers hold various benefits such as being nutritious, great, and even tasty, especially in the summertime.
  • If you are handling your cucumber plants with proper care like the canna bulbs then they will give you the desired results. 
  • Cucumbers are known for their amazing and refreshing taste that gives you nutritional value such as minerals, and vitamins and even keeps you hydrated all the time.
  • One of the common problems that most gardeners face is that their cucumber leaves start to turn a yellow color.
  • It may be due to various reasons that you are not aware of. Some of the causes are improper water supply, lack of nutrients, excessive sunlight, and many more which are explained below.

What Is Leaf Yellowing?

The leaf yellowing means that your plant is facing some kind of deficiency such as chlorosis. You might have heard about the term chlorosis. In this, the leaves are short of chlorophyll, the green component that is found in plants for their growth and color.

If plants don’t get enough chlorophyll which happens at the time of photosynthesis. Then, the plants will not be able to consume the energy from the various sources for their growth. 

The harvest period gets delayed when these plants start to take yellow color which is not a good sign. Do you see any kind of spots on the leaves? If yes, then it is due to the infection spread by the powdery mildew which harms the plants. You have to cure them with the help of any organic pest control or even fungicide. 

Why cucumber leaves are turning yellow: How to fix them? 

If you are worried about the issue of yellowing cucumber leaves, then don’t worry. Firstly, you have to come to understand the reasons behind it and then the ways to fix them as prevention is needed for preserving the plants. Below are the reasons: 

1. Improper water 

The foremost reason for the turning of cucumber leaves into yellow color is the improper water intake for the cucumber plants. Your plants need to be nourished fully with a good quantity of water for their growth and expansion. It might be happening due to the overwatering or underwatering of the plants which will cause the problem. 

Overwatering of cucumber plants will cause the roots of the plants to feel a shortage of oxygen. This is the reason that the cucumber leaves will start to wilt and become yellow.  

Another reason is underwatering your plants. An insufficient supply of water will damage them by yellowing their leaves. 

How to fix:

  • You can fix this issue by watering your plants daily. 
  • You can check the soil by putting a finger into it and if it feels dry, then you can water them. 
  • You can grow the cucumbers in raised beds which will prevent the leaves from becoming yellow. 
  • One can use any kind of gadget for measuring the soil which will prevent under-watering conditions.  

2. Improper fertilization 

You might have heard a phrase that excess of everything is bad. If your plants are getting the fertilizers in an over quantity, then it will harm the plants. Over-fertilizing will turn the leaves yellow. It will trouble the plants to take the water for their growth. You should know that cucumbers consume 95% of water and less water will harm the plants, so it is important to know how often to water cucumber plants.

How to fix: 

  • You have to stop giving fertilizers to your plants in large quantities. 
  • You can cut the yellow leaves of your cucumber plant so that the green leaves can take the energy. 
  • The number of fertilizers you were providing them before, reduce that to half it.  

3. Shortage of nutrients 

When you find yellow-colored leaves on the cucumber plant, it also depicts that your plant is not getting enough nutrients such as calcium, iron, nitrogen, etc. Being heavy feeders, they need to gain water and nutrients in a sufficient amount for their growth and expansion. 

How to fix: 

  • You can fertilize the plants regularly with a mild fertilizer for providing nutrients to your cucumber plants. 
  • Make sure not to over-fertilize the plants.
  • Give potassium and phosphorus to your plants so that they remain strong and give you the desired results. 

4. Improper sunlight 

You have to provide a sufficient amount of sunlight for its growth as it is the main reason behind the turning of cucumber leaves into yellow color.

If you plant your cucumber plants inside, then also they need to take the sunlight efficiently and the same goes for the outdoor cucumber plants. They need at least 6 hours of sunlight for their growth. 

How to fix

  • You can shift your plants where they receive at least 6 hours of sunlight
  • You can use fluorescent lighting for the plants so that they do not face a shortage of sunlight. 

How can you prevent the leaves from becoming yellow? 

It is always said that prevention is better than cure. So why not prevent your leaves from becoming yellow at first only? But this will happen when you are aware of the precautions you need to follow. They are: 

  • You have to make sure that you are using pesticides daily so that the pests do not harm the plants. 
  • You have to provide a sufficient amount of nutrients to your plants so that they remain green. 
  • Make sure you trim the plants when needed as it will generate new growth in the plants. 
  • Feed them properly with the right amount of water

Concluding lines

Last but not least, Cucumbers are known for their amazing and refreshing taste that gives you nutritional value such as minerals, and vitamins and even keeps you hydrated all the time. People in the US tend to grow them in their gardens as it is a common vegetable that everyone loves to eat. Some people started facing some issues regarding their cucumber plants. All the problems related to this will be cured or fixed if you read it carefully. 


1. Can you remove yellow cucumber leaves?

Yes, you can remove the yellow leaves of the cucumber plant. If you will not, then it will spread all around and you will lose your plant. 

2. How does one fix yellowing plants?

One can easily fix the yellowing plants by checking the moisture of the plant. You can also provide them with proper sunlight so that they do not turn yellow. You have to feed them properly which will fix them. 

3. What is the best fertilizer for cucumbers?

A cucumber plant needs potassium and phosphorus, so they can suit best in organic plant food. 

Becky Decker

Becky Decker, our esteemed Editor-in-Chief, is a passionate gardener with years of experience in the world of horticulture. With her guidance, BonjourGreen.com aims to be your trusted companion on your gardening journey. Featured In   Becky Decker’s expertise and gardening wisdom have been recognized and featured in various prominent publications, including:   Homesandgardens.com Yahoo.com Urbansplatter.com Inkl.com Foliagefriend.com Yahoonews  Experience & Background   Becky Decker’s love for gardening has been a lifelong journey. She has honed her skills through countless seasons of planting, nurturing, and harvesting a wide variety of plants, flowers, and vegetables. Her deep-rooted knowledge is complemented by her Bachelor’s degree in Horticulture from the University of Green Valley.   Prior to leading BonjourGreen.com, Becky worked as a garden consultant, helping countless individuals turn their outdoor spaces into vibrant, thriving gardens. Her experience spans over a decade, making her a trusted authority in the gardening community.   The Birth of BonjourGreen.com   Inspired by her passion for gardening and her desire to share her expertise with a wider audience, Becky Decker launched BonjourGreen.com in 2021. This platform serves as a hub for gardening enthusiasts of all levels, from beginners to seasoned pros.   At BonjourGreen.com, we are committed to providing you with comprehensive guides, expert advice, and hands-on tips to help you achieve success in your gardening endeavors. Whether you have a small balcony garden or a sprawling backyard paradise, we have the information you need to make your garden flourish.   Our Mission   BonjourGreen.com is more than just a gardening website; it’s a community of gardeners who share a common love for nurturing the Earth. Our mission is to empower you with the knowledge and resources to create beautiful, sustainable gardens that bring joy and tranquility to your life.   Join Us on This Green Journey   We invite you to explore BonjourGreen.com and embark on your gardening journey with us. Whether you’re seeking advice on planting techniques, pest control, landscaping ideas, or the latest gardening trends, you’ll find it all right here.   Connect with us, ask questions, and share your gardening stories. Together, we’ll cultivate a thriving community of gardeners and help each other make the world a greener, more beautiful place.   Let’s dig in and grow together at BonjourGreen.com, where gardening dreams bloom!

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