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Do Cucumbers Like Coffee Grounds? A Step-By-Step Answer

by Idris Ya'u
This article was fact checked.
Helpful: 100%

Coffee grounds have emerged as a popular choice for gardeners looking to boost their plant’s health naturally.

But when it comes to cucumbers, a staple veggie loved by many, do these vine-crawling plants actually benefit from coffee grounds?

As it turns out, it’s true! Coffee grounds can help your cucumbers grow like never before!

Let’s delve into this topic and find out if your morning brew’s leftovers could be the key to happier, healthier cucumbers.

Key Points

  • Cucumbers DO like coffee grounds. They improve soil texture and increase soil acidity. They can also be used as mulch to suppress weeds or be added to compost.
  • Coffee grounds release nitrogen and other nutrients into the soil, which helps cucumber plants grow healthier and better.
  • When using coffee grounds as fertilizer, mix them into the soil around the plants, start with a moderate amount, and gradually increase over time.
  • Other plants, like roses, blueberries, tomatoes, and radishes, also benefit from using coffee grounds in the garden.
  • Remember to use coffee grounds in moderation and mix them with other organic compost matter for best results.

Why Do Cucumbers Like Coffee Grounds?

1. Improved Soil Texture

Adding coffee grounds to your garden can work wonders for the soil. Here’s how it works.

When you sprinkle coffee grounds into the garden, they mix with the soil. This mixture prevents the formation of a hard crust on the soil which often stops water from seeping through. Instead, the coffee grounds make sure water flows easily to your plants’ roots.

This simple addition to your gardening routine could significantly improve how water travels through the soil.

A soil containing coffee grounds has an improved texture as well as organic content, which is preferable for growing vegetable crops like cucumbers.

Coffee grounds break down and release nitrogen and nutrients into the soil while also keeping the soil loose and aerated. 

Watering your garden containing coffee grounds with alkaline tap water will help neutralize the soil.

Related: Find out plants that love coffee grounds here.

2. Increased Soil Acidity

Coffee grounds are slightly acidic, with a pH level of 6.5 – 6.8. Cucumbers tend to have better growth in soil with a pH level of 6.0 – 7.0. This is because they prefer moderately acidic soil as it drains well and is substantially fertile.

The higher the pH level of the soil, the less prone the cucumbers will be to certain fungal diseases.

Cucumber plants are lovers of acidic soil, and an addition of coffee grounds to the soil will make the soil acidic.

3. Provision of Good Compost

Coffee grounds provide a good addition to your compost pile.

A compost requires green and brown materials, but these materials must be balanced. We suggest following the ratio of 3:1 for brown to green compost material.

A compost pile containing too many green waste materials will give an offensive odor.

Adding coffee grounds to your compost pile boosts its microbial activity. This tiny yet powerful ingredient energizes the tiny organisms living in the compost. As these microscopic creatures become more lively, they speed up the decomposition process.

Essentially, with coffee grounds in the mix, your compost works faster and more efficiently.

Plus, the internal temperatures are increased, which helps in eliminating many fungi and pathogenic bacteria.

A compost pile containing coffee grounds will help improve the soil’s structure and fertility and, thus, benefit the cucumbers.

Tip: Learn How To Use And Avoid Too Much Coffee Grounds In Compost.

4. High Amount of Nutrients

Coffee grounds have a lot of potassium, magnesium, phosphorus, nitrogen and other nutrients needed for the healthy growth of the plants.

Here is a simplified breakout of what coffee grounds offer:

NutrientBenefit to Plants
NitrogenEncourages leafy growth and green coloration
PotassiumSupports overall health and disease resistance
PhosphorusAids in the development of roots and flowers

Cucumber plants are known to grow well in rich and organic soil. The presence of coffee grounds in the soil will help the cucumber plants grow healthier and better.

5. Can Be Used as Mulch to Suppress Weeds

Like other plants, cucumbers do not like weeds. These pesky intruders can reduce the airflow of cucumbers, especially if there are too many of them.

Fresh coffee grounds can help suppress the weeds through mulching, and this can be done around the cucumber plants. Mulching your cucumber beds will help in suppressing the weeds while also keeping the soil moist.

Other benefits of coffee grounds on cucumber plants include using them as fertilizer or using them as pesticides to control pests or diseases.

coffee beans

How to Use Coffee Grounds as Fertilizer

Wondering how to add coffee grounds to your garden? Here’s a simple guide on how to do it:

  1. Start by collecting coffee grounds from your coffee maker. Ensure you allow them to cool before using them.
  2. Dry the coffee grounds if you are not using them right away. Spread them out in a thin layer on a flat surface like a baking sheet and let them dry in the sun.
  3. Start with a moderate amount. For beginners, start with a cup or two on a patch of your garden.
  4. Gradually add more coffee grounds to your soil over time. Doing so will give your plants time to adjust to the new addition.
  5. Mix coffee grounds into the soil, about 4 to 6 inches deep. Ensure the grounds are mixed well with the existing soil.
  6. Add the grounds around the base of the plants.
  7. Water your plants afterward. Coffee grounds can be drying, so ensure your plants get plenty of water after applying.
  8. Keep an eye on your plants to see how they react to the added coffee grounds. Not all plants love coffee grounds, if you notice any yellowing or other signs of distress, stop using the grounds and consult a gardening expert.

Remember, too much of anything isn’t good, so ensure you balance the amount of coffee grounds you add to your garden.

If you want to learn more about coffee grounds and how to use them, you can read our detailed guide here.

a close up view of a brown substance

Other Plants and Vegetables that Benefit from Adding Coffee Grounds in Your Garden

While cucumbers can benefit greatly from coffee grounds, other plants and vegetables can also benefit from this natural fertilizer. 

Here is a table showing other plants that like coffee grounds:

RosesCoffee grounds provide a good source of acidity and nutrients like nitrogen that roses crave. It helps to improve flower bloom and healthy growth of roses.
BlueberriesBlueberries are acid-loving plants, and coffee grounds are slightly acidic, which makes them a perfect match. Coffee grounds add nutrients to the soil and can increase the yield of blueberries.
CarrotsCoffee grounds may increase the size and quantity of the crop, as carrots benefit from the extra potassium and phosphorus in the coffee grounds.
AzaleasSimilar to blueberries, azaleas are acid-loving plants. Coffee grounds can help in supplying the necessary acidity and also enhance the floral blooms. 
TomatoesTomato plants benefit from the nitrogen and other nutrients found in coffee grounds. This helps strong plant growth and increases the yield of the tomato.
RadishesCoffee grounds can often deter pests that target radishes, making it very beneficial for these types of plants.
PotatoesThe additional nutrients, particularly potassium and phosphorus, help in producing a healthy potato crop. 
HydrangeasCoffee grounds can alter the pH of the soil, affecting the color of hydrangea flowers. Lower pH makes the flowers blue; higher pH turns them pink.
RhododendronsLike azaleas and blueberries, rhododendrons are acid-loving plants, so coffee grounds help in boosting their growth and blooms.
SpinachCoffee grounds can provide necessary nutrients like nitrogen and potassium, which helps in the faster growth of spinach.

Remember, coffee grounds should be used in moderation and mixed in with your regular organic compost matter for the best results.


Coffee grounds can be an excellent addition to the garden, particularly for growing cucumbers and various other plants and vegetables.

They enhance soil texture, increase soil acidity, supply essential nutrients, act as a form of pest control, and can even be used as mulch to suppress weeds. However, it’s important to use coffee grounds in moderation and properly integrate them into the soil or compost to avoid any negative effects on your plants.

For those looking to give their cucumbers and garden a boost, incorporating coffee grounds could be a simple, cost-effective, and eco-friendly method.

Just remember to start with small amounts, observe how your plants react, and adjust accordingly. With the right approach, you might find that coffee grounds are the secret ingredient your garden has been missing.

Let your cucumbers and other favored plants thrive by leveraging what might otherwise be morning coffee waste and turning it into a valuable resource for your garden!


Do cucumber plants like coffee grounds?

Yes, cucumber plants do like coffee grounds as they provide nutrients and help improve soil quality.

How can I use coffee grounds for my garden plants?

You can sprinkle coffee grounds around the base of your garden plants or mix them into the soil to help enrich it with organic matter.

Are coffee grounds good for plants?

Yes, coffee grounds are good for plants as they contain minerals like nitrogen, potassium, and phosphorus that can benefit plant growth.

Can I put coffee grounds in my compost pile?

Yes, coffee grounds are a great addition to the compost pile as they help increase nitrogen levels and break down organic matter.

How can I use coffee grounds as a fertilizer?

You can mix coffee grounds with water to create a liquid fertilizer or sprinkle dried coffee grounds around plants as a slow-release nutrient source.

Can coffee grounds be used when growing vegetable crops like potatoes?

Yes, coffee grounds can be beneficial when growing vegetable crops such as potatoes as they provide essential nutrients for healthy plant growth.

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