6 Fixes for Yellow Leaves on Zucchini

Zucchini is a fast-growing vegetable that is very popular in the summer season. Many people grow it in their garden as it is very easy to grow. When you have much zucchini, there is a chance that you will suffer from a few yellow leaves on the plant. 

Zucchinis are a staple of summer meals. But if the leaves have started to turn yellow, you may be looking at the end of your favourite vegetable. You may not have to toss those zucchinis, however. They can still be salvageable.

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Here look at five of the common reasons why zucchini leaves turn yellow. 

Lack of Nitrogen

If the leaves of your zucchini plants are turning yellow, there is likely an issue with the amount of nitrogen in the soil. Zucchini plants need plenty of nitrogen, so they will suffer if you aren’t providing enough. 

If you think you have a nitrogen deficiency, you can do a few things to fix it. Add more nitrogen-rich fertilizers to your soil. Its best to buy an all-round vegetable fertilizer like 10-10-10 I will either use miracle gro or a seaweed extract.

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Too Much Water

Zucchini plants need plenty of water to grow big and beautiful. But too much or too little water can cause problems. If your zucchini plant has yellow leaves, it’s getting either too much or too little water. 

If your zucchini plants grow in containers, it’s likely too little water. With zucchini plants, it’s best to water them every other day. Of course, if you live in an area of rain or below-average temperatures for a long time, you should check the soil to ensure it’s not too dry. Zucchini plants may have yellow leaves if the soil is too dry.

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Right Nutrients

Here are the steps to ensure your zucchini plants get the right amount of nutrients. First, unblock the drainage holes at the bottom of your pot. Then, add a layer of organic compost to your soil. Then add a layer of mulch on top of that. 

Next, cut back your zucchini plants, so they have 3 inches of space between the top of the soil and the plant. Then, add a layer of organic fertilizer to the mulch and water your plants. If your plants continue to be yellow or have missing leaves, you’ll need to add more compost or fertilizer.

As the plants grow the leaves lower down the plant will start to die back and go white / grey this is completely normal, and I normally just chop them back.

Disease Or Pest Infection

Yellow leaves on your zucchini plants can signify disease or pests. If a pest infests the plant, the leaves may curl or turn yellow. If you see a zucchini plant with yellow leaves and no pests, check for signs of disease. 

Look for and remove any diseased or pest-infected leaves. Then, spray the plant with warm water and mild liquid soap to help kill the pests.


While it’s a great thing to have a plant in your home, it’s also vital that you know how to care for them. Plants are living things, and like any living thing, they need to be taken care of properly to do well. 

One common problem people run into is when the leaves start to yellow, and there are big brown spots on them. But don’t worry; this is very easy to fix. Sometimes, telling someone to move it to a shadier place is the answer, but it could also mean watering it or moving the pot to another location.

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Preventing Yellow Leaves

The first step to preventing yellow leaves on a zucchini plant is to make sure that you’re planting a resistant variety. There are plenty of options to choose from. 

If you already have a zucchini plant and it’s developing yellow leaves, assess its overall health by lifting it from the soil to see if the roots are healthy and the ground is well-draining. If not, you might want to add more soil amendments to fix the problem. Otherwise, you can also prune the leaves that are developing yellow leaves.

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