Why Are My Zucchini Short And Fat (7 Reasons + Solutions)

A long healthy Zucchini increases our appetite, unlike short and fat zucchini. To have a healthy appetite people nowadays are cultivating several with tables in their garden like zucchini.

They often ask the question, Why is my Zucchini short and fat?

There are several reasons why your zucchini can be short and fat. Some noteworthy reasons are cross-pollination with squash, deficiency of nutrients, low-quality soil, deficiency of water and sunlight, attack by pests, and getting infected by diseases. 

Identify the reason why your Zucchini is turning out to be short and fat then it is easy to take care of those reasons.

But some of these reasons need to be taken care of before you start planning your Zucchini seeds like the soil quality and the deficiency of nutrients.

Reasons  Solutions 
Cross pollination  Don’t plant Zucchini and Squash together. 
Deficiency of Nutrients Provide nitrogen base fertilizer, phosphorus, potassium, and iron.
Deficiency of Sunlight Provide at least 6 hours of daylight.
Low quality soil Check the texture of the soil and pH balance.
Lack of Water Provide once inch of water per week.
Affected by Disease Apply fungicides. 
Attack by Pests Use neem oil mixture or pesticides. 

7 Reasons Why Zucchini Grows to Be Short and Fat

1. Cross Pollination with Squash

Zucchini and squash belong to the same species of vegetables. When the vegetables are of the same species it is possible that there will be cross-pollination.

Cross-pollination produces dominant and latent genes. 

When these plants are grown side by side they tend to exchange pollen grains with winds and bees.

Cross-pollination will not give you the perfect zucchini. The shape of the zucchini will tend to get the shape of a Squash which has half fat bottom. 

This also affects the length of the zucchini. Overall you can say that the process of pollination produces fruit that will be a combination of Zucchini and Squash in looks and taste. 


To avoid cross-pollination the first thing to do is to make sure that the seeds you are buying are actually Zucchini seeds.

Before sowing them take a close look at each seed to ensure that there is no mixture of Squash seeds in them.

Also if you are planning to cultivate Zucchini and Squash together then make sure that they are not planted side by side.

It’s not only that the cultivation bed should be different, it should be made sure that the bees in the area should not have access to both plants at a time. 

Along with checking the seeds of Zucchini you also need to check the seeds of other vegetables that you are planning to cultivate nearby.

This way there will be no squash plants near for the cross-pollination to happen. 

With these precautionary measures, you can avoid the cross-pollination effect and get a good shape in your Zucchini.  

2. Deficiency of Nutrients

The deficiency of nutrients can cause growth issues in any kind of plant. When it comes to Zucchini you will see the defectiveness in shape.

Due to the lack of nutrients, Zucchini can even get too short and fatty that it will take a round shape.

You will understand that the change of shape is the result of the lack of nutrients when most of the Zucchinis are fat and short. Sometimes they are even short and thin. 

If you’re planning to cultivate Zucchini for business purposes then this deficiency can be threatening.

When we are speaking about the deficiency of nutrients, it means an imbalance of nitrogen, a deficiency of potassium, Phosphorus, and iron. 

The deficiencies can arise in two stages. First, if the soil was infertile before you planted zucchini. The second is that the soil becomes infertile after you have planted Zucchini.

Therefore it is important not only to plant Zucchini in fertile soil but to maintain the fertility of the soil using fertilizer as required. 


To avoid the deficiency of nutrients, prepare the soil bed three weeks ahead of sowing the seeds. Dig about 4 inches of soil and mix it with composted organic matter.

You can prepare the compost in your home or can buy it online.

You also need to apply organic Fertilizers in liquid form. These fertilizers are developed to prepare soil beds to get enriched with nutrients.

Along with general organic fertilizer you can also find organic fertilizers that are specialized in zucchini.

Once the seeds are planted you will again need to use fertilizer after the plants are almost ready to flower.

It is best to use nitrogen-based fertilizer for zucchini. But they should also have a substantial amount of potassium and phosphate. 

With before and after care of planting Zucchini it is possible to prevent malnutrition in Zucchini production.

A balance of Nitrogen, Phosphorus, potassium, and iron ensures that your Zucchini grows tall and healthy.

3. Deficiency of Sunlight

The Zucchini plant is a summer plant. This means that it will need abundant Sunlight to grow and produce healthy fruit.

Sunlight helps zucchini to perform photosynthesis using proper nutrients. This also plays an important role in transferring nutrients to every part of the plant. 

The sunlight requirement for healthy Zucchini production is at least 6 hours a day. It can go up to 10 hours.

If by any means your plant is having sunlight lower than 6 hours a day then the growth of Zucchini itself will be stunted. 

Therefore if you see that the Zucchinis are short and fat with an indication that you need to shift the plant to a more sunny place if possible.

The deficiency of sunlight can even affect the flower blooming, to begin with. 


The first thing to solve the problem is to plant the Zucchini seeds in a place where they can get proper sunlight.

Especially if it is planted on a soil bed. In that case, the access to sunlight has to be insured before planting. 

If you have planted the Zucchini in a pot or the soil bed is movable then make sure that you move it to a sunny place.

But it should also ensure that the direct sunlight is not raising the temperature of the zucchini plant. 

Balancing the requirement of Sunlight with the temperature tolerance of Zucchini can be a tricky job.

But if you want your plan to have a healthy production it is important to balance these two factors. Otherwise, she will continue to get short and fat Zucchini from your blanket. 

4. Lower Soil Condition

Good soil is also an important plant for zucchini. If the soil is not interested in organic matter then it will even be difficult to enrich it with fertilizers. 

If the soil is too sandy or too clayey then it will fail to hold water and fertilizers. The pH balance of the soil also plays a vital role in the quality of the soil. 

Whenever the soil is of low quality, it will not hold to any kind of nurturing you provide.

This will lead to all the other factors that can cause defectiveness in your Zucchini production. The size of the Zucchini will be stunted. You will get short and fat zucchini. 


It is quite difficult to change the condition of soil from sandy and clayey to perfect texture after you have planted zucchini.

Therefore whatever you are planning to do needs to be done before planting the seeds. 

The best thing to do is check the texture of the soil. Doing soil testing from time to time will ensure that your soil hasn’t lost its fertility with name.

You need soil that can hold water for a sustainable amount of time. 

Once you confirm the texture it comes to checking of pH balance. The ideal pH balance for Zucchini cultivation is between 6 to 7. This range is not much acidic but still on the acidic side. 

At this level, the water balance can be maintained. Also, this will not change the pH balance after using fertilizer in both granular and liquid form. 

5. Lack of Water

For Zucchini to grow properly it is necessary to provide an adequate amount of water timely. In the whole nursing process of Zucchini, water plays an important role.

About 50% of Zucchini is made of water. Therefore it needs a large quantity of water compared to other vegetables to grow. 

While cultivating Zucchini of any form make sure that the soil has enough moisture consistently.

The plants of Zucchini absorb lots of water which make the soil dry very easily. For the survival of Zucchini, you will need to provide around one inch of water per week. 

Whenever there is a deficiency of water in Zucchini cultivation, it will temper the quality of the product. Quality fall also includes size defamation of the zucchini.  


As the requirement of water for Zucchini is one inch per week, that doesn’t mean you have to provide it at a time. Rather it is wise to water the plant twice or thrice a week. 

When you provide one inch of water at a time in a week there is a possibility that the water deposition will damage the plant.

Therefore, sprinkle water two or three times a week. This will help the soil to hold moisture as required by the Zucchini plant.

6. Affected by Disease

Powdery mildew and downy mildew are two major diseases of Zucchini that are caused by fungus.

Due to these two diseases deformation of size is very common in Zucchini. They tend to grow fat and are short in size. 

When the plants get affected by these diseases there are sprinkles of powder-like substance in the Zucchini and the plant.

These diseases can take a serious turn if not taken care of in the right term. 


To take care of Powdery mildew and downy mildew you will need to apply a combination of cultural practices and fungicides.

To get a proper treatment for these diseases make sure that your fungi sites include copper hydroxide, chlorothalonil, and mancozeb.

Also to prevent the disease ensure that there is proper air circulation to the plant. 

7. Attack by Pests

In most of the cases while getting attacked by the pests Zucchini tends to get stunned in size.

This means you will end up cultivating short and fat zucchini. 

Bugs like cucumber beetles, squash bugs, and aphids tend to get attracted to Zucchini more.

Along with the definition of shape and size, you will also find yellow leaves and misshapen fruits due to the attack of these pests. 


There are two ways you can take care of pest attacks in your Zucchini cultivation. The first one is a natural process.

In this process, you will have to make Neem oil with water and spray it on your plants.

Applying this mixture 2 times a day will help you to get rid of the bugs. The best time for application is in the morning and the evening. 

Another way to control the pest is to use specific pest control chemicals.

These chemicals will prevent the best attack and also control the attack. If the case is severe then try to take help from an agriculture specialist. 

Basic Care of Zucchini

Requirement of Zucchini Plants Scale 
pH of soil  6 to 7
Temperature  65 degrees Fahrenheit to 75 degrees Fahrenheit
Climate  Early summer
Fertilizer  Must contain phosphorus, potassium and nitrogen.


What Happens If You Over-Water Zucchini?

The four fundamental indications of overwatering your zucchini plants are slow development, yellow leaves, the presence of form, and natural product decaying on the plant.

An excessive amount of water cleans supplements out of the dirt and can leave the roots waterlogged. Giving your zucchinis barely enough water to flourish is frequently truly a test.

Why Is My Zucchini Bulbous?

Cool temperatures might make female blooms open before the male ones. This issue is most normal from the get-go in the developing season.

At the point when the female blossoms open too early, there isn’t sufficient dust for full treatment. The unfertilized seeds don’t develop, bringing about deformities in the organic product.

Why Are My Zucchini Not Growing to Full Size?

One issue that is of critical concern is unfortunate fertilization. Zucchini should be visited by a ton of honey bees or different pollinators for effective fertilization, generally, the natural products will be cut off.

At the point when this happens, the natural products will quit developing, become yellow, and may begin to decay.

Do You Need Two Zucchini Plants to Produce Fruit?

The explanation this is significant while developing zucchini is on the grounds that its blossoms should be pollinated to frame a reasonable natural product, and every female bloom is just open for one day.

No fertilization implies no zucchini. Along these lines, assuming you have various plants becoming close to one another, your opportunity of fertilization extraordinarily gets to the next level.

How Do You Fertilize Zucchini?

You might utilize a water solvent or granule compost. On the off chance that utilizing a water-dissolvable compost, weaken it with water as indicated by the maker’s guidelines.

For granular composts, spread the granules around the plants at the pace of 1 ½ pounds for every 100 square feet.

Final Words

After reading this post you will not ask anymore, Why are my Zucchini short and fat?

If you have taken all the steps and still the zucchinis are turning out to be short and fat then you must identify the reasons.

For this, the best option is to take help from an agriculture specialist. This way you can have healthy Zucchini in your garden.

These steps are also solutions to many other problems that can arise in your Zucchini cultivation. 

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