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How to Fertilize Cucumbers [3 Periods of Fertilizing]

When it comes to creating healthy, long-lived, and prolific cucumber plants, fertilization is always important! The method and timing of fertilization play a vital role. If you have a cucumber garden then knowing the proper method is mandatory. 

How to fertilize cucumbers?

Cucumber fertilization is a three-stage process that requires three distinct doses of nutrients. At planting time, put a generous amount of compost. When your seedlings emerge from the soil, it’s time for mulching. And at a mature stage, fertilize your cucumber with liquid organic fertilizer.

The above info is just a quick overview. I guess you should dive deeper and learn the complete process. Just follow this content!

The Importance of Fertilization

Cucumber cultivation relies heavily on fertilization. A consistent supply of nutrients is necessary for cucumbers to grow.

Even the finest soil, however, loses nutrients as plants grow. This occurs in garden soil, and it’s exacerbated in garden beds and tobs. Additionally, plants aren’t able to reach their maximum potential when energy supplies are insufficient.

Cucumber needs a modest dosage of fertilizer every 10-14 days to thrive and produce well. The ideal technique is to use liquids that absorb through the roots and leaves.

Types of Fertilizer You may Need

Cucumber requires heavy potassium and phosphorus fertilizers. They need little nitrogen to let the plant blossom and fruit more. Add compost or organic stuff to your soil. These will help to grow cucumber faster and taste better.

You may add dried seaweed to boost the soil for a better harvest. It helps to reduce disease in your plant. In this article, I will suggest you compost, mulch, and liquid organic fertilizer. 


Compost is made from waste materials. They include food scraps, animal dung, leaves, straw, and more. Compost contains a wide variety of microbes and nutrients that help plants grow and develop properly.


Mulch is used to keep the soil cool, preserve moisture, and discourage weeds. As organic mulches disintegrate, they also contribute to the soil’s structure, drainage, and nutrient-holding capacity. There are multiple types of organic mulch you may use.

Liquid Organic Fertilizer

Organic wastes are used as carbon substrates. They are used in simple fermentation procedures to make liquid organic fertilizer. It includes necessary plant nutrients as well as useful microbes.

Here you’ve learnt about the types of fertilizer. And now we’ll move to the fertilization process.

How to Fertilize Cucumber?

The process of fertilization requires three time periods. In these periods, you will know about cucumber nutrient requirements. I will share tips on how to power your plants for optimal productivity and health.

Period 1: Seed Sowing

Cucumber growing success begins with a good start on the first day of planting. And if you can make a good start then the whole process will be smoother. The amount of fertilization will depend on the quality of your seeds and soil. 

You have to make a good mixture of soil and compost at this time. In general, the ratio should be equal. You should use compost. Because it is fully natural and balanced for seeds. You can revive your dying roses with it. 

Period 2: After Germination of Seed

As soon as the seeds come out from the soil, it is time to mulch. Mulch not only assists in weed control but also in regulating soil temperature. Both of these factors are critical for developing healthy, productive plants. 

In the first layer of mulch, spread a 5 cm thick coat of compost. And it should be 15 cm in diameter around each plant. Also, add a quarter cup of worm castings to the compost! Then, as usual, add your mulch.

Now, the ring of compost will fertilize the plants slowly with the help of water. And this method is very effective for the growth of newly born plants.

Period 3: Matured Stage Fertilization

In this stage, your plants are established and now you have to provide fertilizer regularly. But not too much. You should apply a mild amount of fertilizer. 

If you don’t apply fertilizer in this period, then the growth will be decreased. Again, if you overfeed them, they’ll only produce leaves and a few cucumbers. 

Too much or too frequent fertilizer causes vegetable plants to grow foliage rather than flowers. As a result, production decreased.  

How do you know if your plants are established or not? When your plants have grown sufficiently at least a couple of inches tall. And have formed 3 to 5 leaves, at that stage you can call established plants.

In this period you have to use liquid fertilizer for your cucumbers. Liquid fertilizers are distributed through the leaves as well as the roots. This dual interaction is extremely beneficial to plants.

It is very effective in terms of obtaining the nutrients they require to grow. It may even help to grow grass on a dirty dry surface.

There are many types of liquid fertilizers available in the market. But you need to know which one you should use for cucumbers. I can help you to choose. you may use these two for your plants:

Fox Farm Grow Big Liquid Concentrate FertilizerGood for flower and bud development 
Miracle-Gro Shake ‘N Feed Tomato, Fruit & Vegetable Plant FoodGives instant nutrients 

These are really effective in terms of growth and productivity. Hope our suggestion will help your harvesting.

Some Additional Tips

Once the plants begin to produce fruits and flowers, no additional fertilization is required. Indeed, it can have a negative effect on subsequent production. 

Early in the morning or late in the evening is the best time to water cucumbers. Make every effort to avoid wetting leaves. Cucumber disease can be prevented by treating the leaves in this way.

Try to avoid artificial fertilizers for your plants. Always use organic liquid fertilizers for natural growth. It is also good for the soil and nature. Pokeweed Plants can be harmful to your garden. Remove Pokeweed Plants as soon as possible for a better harvest.


Question: Should I fertilize my cucumber plants?

Answer: You should fertilize them in several periods. Fertilization of your plants will increase the production and the quality of your cucumbers.   

Question: Is Epsom salt good for cucumbers?

Answer: By the middle of the season, your cucumbers may have become weathered and ragged. Epsom Salts can be used to help green them up and give them a push.

Question: How Much Sunlight Do Cucumbers Need? 

Answer: Cucumbers require at least 8-10 hours of direct sunlight per day to thrive. They are warm-season veggies that thrive in direct sunlight.


I hope that you’ve got to know how to fertilize cucumbers.

One more thing, knowing your soil type helps determine how much nutrients your cucumbers need. Keep it in mind. Do some soil tests before putting fertilizer.

Good luck!