How To Stop Your Cucumbers From Growing Bitter

No one likes a bitter cucumber. Unfortunately, if your cucumbers grow bitter, it can be quite a challenge to stop them from tasting that way. It’s not easy to identify the root cause of the problem, but you can do plenty of things to help.

To stop your cucumbers from growing bitter:

  1. Check the temperature of their environment.
  2. Make sure you’re watering correctly.
  3. Protect your cucumbers from pests and diseases.
  4. Assess the soil quality. 
  5. Give your cucumbers the correct exposure to light.
  6. Keep cucumbers away from heavy feeders. 
  7. Grow in the perfect season. 
  8. Choose the right cucumber variety. 
  9. Harvest them properly.
  10. Store them well.
  11. Find alternative uses for bitter cucumbers.

In this article, I will discuss what causes cucumbers to grow bitter and how you can prevent it from happening. I will also provide some tips on preparing the soil and cultivating your cucumbers correctly to taste delicious!

1. Check the Temperature of Their Environment

You may not be able to pinpoint what is causing the bitterness in your cucumbers. However, the most likely cause will be some kind of stress the cucumbers suffer while they are growing. 

One common condition that can lead to bitter cucumbers is cold weather. When the temperature drops too low, cucumber plants will stop growing and may even die.

If you live in an area where the temperatures drop below 50 °F (10 °C), you may want to consider growing your cucumbers indoors. You can also try using a greenhouse or cloche to keep them warm.

2. Make Sure You’re Watering Correctly

Cucumbers need plenty of water to grow properly and produce delicious fruits. If they don’t get enough, they will start to create more cucurbitacin to protect themselves.

That can result in cucumbers that are not only bitter but also tough and seedy. So make sure to water your cucumber plants regularly, especially during hot, dry weather. You may also consider using mulch to help keep the soil moist.

Try not to let your plants get stressed by drought or low soil moisture levels. Make sure they receive at least an inch (2.5 cm) of water per week during hot weather conditions and a half-inch (1.27 cm) every two weeks if it’s cooler.

3. Protect Your Cucumbers From Pests and Diseases

If you have pests or diseases in your garden, this may also contribute to bitterness in your cucumbers. If the plants are under stress from being attacked by bugs or fungi, they will produce more cucurbitacin to protect themselves from harm.

To avoid pests and diseases affecting the taste of your cucumbers, make sure you keep them well-watered so that they don’t get stressed out easily. In addition, it’s important not to let any infected fruits rot on the vine as this can spread disease throughout the plant.

If pests are eating your cucumbers or your plants suffer from a fungal infection, treat them with an appropriate pesticide or fungicide. Be sure to read the product’s label before using it and follow the instructions carefully.

Powdery Mildew

Powdery mildew is a fungal disease that causes white or gray powdery spots on the leaves of your plants. These spots will eventually turn brown and spread all over the plant, causing it to die.

The best way to prevent this disease is by using an organic fungicide when you first plant your seeds or seedlings (this helps prevent infection before it starts). You can also use neem oil if you notice signs of powdery mildew after planting them in their permanent location outdoors or indoors under grow lights.

Bacterial Wilt

Bacterial wilt is a disease that affects cucumber plants by making them wilt and die. The leaves will turn yellow, then brown, and the stem will become soft and mushy.

There is no cure for bacterial wilt, so it’s crucial to prevent it from occurring in the first place. You can do this by planting your cucumbers in soil that you have treated with compost or manure (this helps increase their disease resistance). Be sure to water them correctly and keep an eye out for any signs of disease.

Spider Mites

Spider mites are tiny pests that can cause a lot of damage to your cucumber plants. They suck the sap from the leaves, which causes them to turn yellow and die.

The best way to prevent spider mites from infesting your plants is by using an insecticide (such as neem oil). You can also use physical barriers such as sticky traps or horticultural oils to catch and kill them. If you already have an infestation, you can remove the mites by spraying your plants with a strong stream of water.

Blossom End Rot

Blossom end rot is a condition that affects the cucumbers near the end of the fruit. The affected area will turn black and mushy.

Blossom end rot occurs in cucumbers when you lack calcium in the soil. You can prevent it by adding limestone or agricultural lime to the dirt before planting your cucumbers. You could also give your plants a calcium boost by spraying them with calcium chloride or calcium nitrate.

Make sure to follow the directions on the product label carefully.

Tip Burn

Tip burn is another condition that affects cucumbers. It causes the edges of the leaves to turn brown and dry up.

Tip burn is most often caused by too much fertilizer or insufficient water. You can prevent it by watering your plants correctly and using the correct amount of fertilizer.

If you already have an infestation, remove the affected leaves and wash them off with a strong stream of water. Repeat this every few days until all signs of tip burn are gone.

Beetle Infestation

Beetle infestation is a common problem that affects cucumbers in many areas. Two types of cucumber beetles you should watch out for are the striped cucumber beetle and the spotted cucumber beetle.

These pests can cause a lot of damage to your plants by eating the leaves and flowers. They can also spread diseases to your plants.

The best way to prevent an infestation is by using an insecticide regularly (you can buy them premixed or make your own). You can also try using physical barriers, such as row covers or netting. If you already have an infestation, you can remove the beetles by hand or garden hose.

4. Assess the Soil Quality

The type, composition, and overall quality of the soil in your garden can significantly affect how your fruits and vegetables will taste like. Therefore, to grow the best-tasting cucumbers, it’s crucial to ensure your soil is suitable for their growth.

Soil pH Levels

The pH levels of your soil can also affect how bitter your cucumbers taste. If the soil is too acidic or alkaline, it can cause the plant’s flavor to be off. An imbalance in the pH levels can also lead to bitterness caused by nutrient deficiencies.

You can test the pH level of your soil with a pH meter, which you can purchase at most garden supply stores. You will want to aim for a neutral soil pH level between 6.0 and 7.0.

Not Enough Nitrogen in the Soil

If the soil you are growing your cucumbers in doesn’t have enough nitrogen, it can cause them to produce more of the bitter compound cucurbitacin. That is because nitrogen is necessary for healthy plant growth.

You can test your soil’s nitrogen levels with a home testing kit or by having it tested at a local garden center. If the levels are low, you can add some organic matter such as compost to help increase them. You may also want to fertilize your plants with a balanced fertilizer that contains nitrogen.

5. Give Your Cucumbers the Right Exposure to Light

Another factor that can cause cucumbers to grow bitter is too much sun exposure. That can cause them to develop sunscalds when the fruit’s skin gets bleached out. Sunburn can also affect the taste and make them more bitter.

If you’re growing your cucumbers outside in a sunny climate, it’s essential to give them some protection from direct sunlight by using shade cloth or other means. You may want to consider growing them indoors if possible as well.

6. Keep Cucumbers Away From Heavy Feeders

Cucumbers are heavy feeders, which means they need many nutrients to grow correctly. If there is competition from other plants that are also heavy feeders, your cucumber plants may not get the nutrients they need.

That can cause them to produce more cucurbitacin to protect themselves from harm due to nutrient deficiencies. 

You may want to consider growing your cucumber plants away from other vegetables such as tomatoes or peppers. That way, there won’t be any competition for resources between different plant types.

7. Grow in the Perfect Season

Cucumbers prefer warm weather and should be grown in areas that have temperatures between 75 and 85 °F (24 and 29 °C).

They should not be grown in cold weather conditions, as this will stress the plant and cause it to produce more cucurbitacin.

Make sure your plants receive sufficient sun exposure and water as well. The soil should be fertile and have a pH level of between 6.0 and 7.0.

Avoid growing cucumbers in soil with low nitrogen levels, leading to bitterness.

8. Choose the Right Cucumber Variety

The different cucumber varieties produce different amounts of cucurbitacin, the compound responsible for bitterness. Some cucumber varieties are more likely to produce bitter fruits than others.

For example, the English cucumber variety is less likely to produce bitter fruits than the American slicing cucumber variety. The English cucumber has a thinner skin and fewer seeds than the slicing variety. As a result, it doesn’t have as much chance to produce the compounds that lead to bitterness.

The varieties with the lowest level of cucurbitacin are Lemon, Aria, Holland, and Jazzer. If you’re concerned about bitterness and want to avoid it entirely, these may be the types that you should plant in your garden.

9. Harvest Them Properly

Harvest your cucumbers when they’re young. While larger cucumbers may look more impressive, smaller ones tend to be sweeter. Don’t let the fruit grow too large on its vine, as this will cause it to produce more of the compound responsible for bitterness (cucurbitacin).

It’s best to pick cucumbers when they’re about 4 to 6 inches (10 to 15 cm) long. If you want to pick them even smaller, 3 inches (7.5 cm) is the ideal size. 

If you pick them too early, your cucumbers may not have developed all of their flavor compounds yet. On the other hand, a later harvest will be overripe and may taste sour or bitter.

10. Store Them Well

Store your cucumbers properly once you harvest them. Place them in a plastic bag and store them in the fridge. They should last for a week or two this way.

If you want them to last even longer, you can pickle them or preserve them in other ways. For example, you can make cucumber pickles, which will last for several months when stored in a cool, dark place.

Make Pickles

Pickling cucumbers is a great way to preserve them for later use. Vinaigrettes and pickling brine are great for reducing the bitterness of cucumbers, making pickling a fantastic choice.

You will need a water bath canner or a pressure canner to pickle cucumbers. You will also need mason jars, lids, and rings to secure the covers.

To make pickles from your cucumbers: 

  1. First, wash your cucumbers and slice them into thin coins. 
  2. Place them in a large pot and cover them with water. 
  3. Bring the water to a boil and then cook the cucumbers for 2-3 minutes. 
  4. Remove them from the pot with a slotted spoon and place them in a bowl of ice water to cool.
  5. Pack the cucumber coins into the mason jars, leaving about half an inch at the top. 
  6. In a separate pot, combine vinegar with sugar and salt and bring it to a boil. 
  7. Pour the hot pickling liquid over your cucumbers until they are covered by about 1 inch (2.5 cm) of the liquid. 
  8. Seal them with lids and rings, then place them in boiling water for 20 minutes. 
  9. Remove from heat and let cool completely before storing in a cool, dry place away from direct sunlight or extreme temperature changes (such as those found near furnaces).

11. Find Alternative Uses

There are alternative uses for cucumbers that are bitter beyond using them in cooking.

If you have bitter cucumbers, here are some great ideas to avoid wastage:

Make Soap

Cucumbers are a great addition to soap because they are high in Vitamin C and contain natural oils beneficial for the skin. They can help soothe sunburns, treat acne, and moisturize.

To make cucumber soap, you will need:

  • 1 cup of grated cucumber
  • 1 cup of melted coconut oil
  • 1 cup of olive oil
  • 2 tablespoons of honey
  • 1 teaspoon of baking soda
  • 1 teaspoon of distilled water
  • Fragrance oil (optional)

Mix the grated cucumber with the melted coconut oil, olive oil, honey, baking soda, and distilled water. Add a few drops of fragrance oil if desired. Pour the soap mixture into a mold and let it cool completely. Once it has hardened, remove it from the mold and cut it into bars.

To use the soap, wet your skin with warm water. Lather up and gently rub it into your skin for one to two minutes, then rinse with cool water. Repeat as needed.

Protect Your Garden

You can use cucumbers and aluminum foil to ward off slugs from your garden. The mix of cucumber and aluminum gives off a smell that slugs detest (although humans can’t smell it). They won’t come near your garden if you use your cucumbers in this way.

To use this method, cut a cucumber into small pieces, put them in an aluminum tin, and then spread them around the perimeter of your garden. Make sure to place them near the plants that you want to protect.

Facial Treatment

Cucumbers are a great way to reduce the appearance of eye puffiness. They contain antioxidants and anti-inflammatory properties that help soothe and refresh the skin around your eyes.

To use cucumbers as a treatment for eye puffiness:

  1. Cut a cucumber into thin slices.
  2. Place them over your eyes. 
  3. Leave them for 10-15 minutes.
  4. Rinse with cool water. 
  5. Repeat as needed.

Calm Sunburn

If you’ve been gardening in the hot sun, you may have sunburn. However, don’t pull out the aloe just yet! You can use cucumbers to calm and soothe sunburns.

Cut a cucumber into thin slices and place them over your sunburn. Leave them on for 10-15 minutes, and then rinse with cool water. Repeat as needed. The cucumbers will help calm and soothe your skin.

Frequently Asked Questions

What Is Cucurbitacin and How Does It Affect Cucumber Taste?

Cucurbitacin is a bitter compound found in cucumbers and other members of the Cucurbitaceae family, including pumpkins, watermelons, and zucchinis. Cucurbitacin develops more as the cucumber or other fruit grows, increasing the bitterness. 

The level of cucurbitacin present in cucumbers will determine how bitter they taste. The higher the level of this compound, the more bitter the cucumber will be.

While all cucumbers contain some level of cucurbitacin, the amount can vary significantly. Some cucumbers may have a barely detectable level, while others can be pretty bitter.

Interestingly, the level of cucurbitacin in a cucumber from the same harvest does not always indicate its bitterness. 

For example, a cucumber stored for a long time may have a higher level of cucurbitacin than one freshly picked. That’s because the compound is a defense mechanism against pests and fungal infections.

What Causes Cucumbers to Grow Bitter?

The level of cucurbitacin present in a cucumber causes the plant to become more bitter. Some cucumber varieties produce more cucurbitacin than others, which means that some cucumber varieties are sweeter than others.

Some of the reasons cucumbers may produce more cucurbitacin include the following:

  • Growing them in warm weather conditions
  • Being stressed due to drought or low soil moisture levels
  • Being eaten by pests or suffering from a fungal infection
  • Raising them in soil that contains too much nitrogen
  • Being overripe and left on the vine for too long

The growing conditions can also affect how bitter a cucumber tastes. The amount of sun exposure, water, and nutrients a plant receives will impact its flavor. Poor soil quality or an imbalance in the pH levels can also lead to bitterness.

Finally, how you harvest and store a cucumber can influence its taste. If you pick it prematurely or don’t store it properly, it may be more likely to taste bitter.

Is It Common for Cucumbers to Become Bitter?

It’s not very common for cucumbers to become bitter, although it does happen on occasion. Some factors, such as the weather or soil conditions, can cause a cucumber to produce more of the bitter compound cucurbitacin.

If you are growing cucumbers in your garden, it is essential to be aware of these potential causes of bitterness. By preparing the soil and selecting a suitable variety of cucumber plants, you can significantly reduce the chances of your cucumbers tasting bitter.

How to Eat Bitter Cucumbers

You can eat bitter cucumbers, but they will not taste as sweet as store-bought cucumbers.

If you want to try them, there are a few techniques you can choose from:

Remove the Skin and Seeds Before Eating

Most of the cucurbitacin is in the skin of the cucumber. So if you want to avoid it, be sure to remove the skin before eating. You can also cut off the ends of the cucumber and slice it into thin slices before eating or cooking with it.

Soak Them in an Ice Bath

Soaking your cucumbers in ice water for a few hours can help reduce their bitterness.

Cut off Both Ends

You can rub the bitterness away by cutting off both ends and rubbing the cut end against the exposed flesh. That will eliminate the bitterness, which means you don’t need to waste any part of your cucumber yield.

Use Salt

Simply sprinkle a small amount of salt on the cut end of the cucumber and rub it in. That will help draw out some of the bitterness and make them taste a little bit better.

Add a Bit of Sugar to the Slices

While sugar can’t completely get rid of the bitterness of cucumbers, it can help make them taste a little bit better. You can add a teaspoon of sugar to every quart of sliced cucumbers and stir until the sugar dissolves. That will help improve their flavor and make them more palatable.


Cucumbers are a great addition to any garden, but they can be tricky to grow. By following the tips discussed in this article, you can prevent many of the most common cucumber-related problems, including bitterness.

Good luck with your cucumber plants!

Dr. Moritz Picot

Dr. Moritz Picot is a horticulture enthusiast and the founder of, where he serves as the lead content writer. He established the website in 2022 as a valuable resource for both gardening aficionados and beginners, compiling all the gardening tips he has accumulated over the past 25 years. Alex has a passion for nurturing plants, transforming backyards into inviting spaces, and sharing his knowledge with the world.

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