Do Hydrangeas Like Coffee Grounds – How Often to Use?

Hydrangeas are beautiful flowering plants and are relatively easy to care for. They come in a variety of colors and can thrive well in a warm environment.

Coffee grounds are a popular fertilizer for many plants, and for hydrangeas too. They are a natural source of nitrogen, which is necessary for plant growth and health. They also aid in maintaining soil acidity, which is necessary for hydrangeas since their colour can be affected by the pH of the soil.

But, do hydrangeas like coffee grounds?

Yes, they like it.

Hydrangeas like coffee grounds as a natural source of nitrogen and maintain soil acidity. The acidity of coffee grounds can also enhance the colour of the hydrangeas to blue instead of normal pink and white colours. While it is safe to use coffee grounds as a fertilizer, too much can be harmful. 

Fertilize Hydrangeas – Nutrients Required

are eggshells good for hydrangeas

Hydrangeas are stunning flowering plants and can look more beautiful if you care properly. One important aspect of taking care of hydrangeas is fertilization.

Fertilizing your hydrangeas is a basic need of plants to give them the nutrients they need to thrive and produce beautiful blooms.

Hydrangeas need a balanced fertilizer that contains three essential nutrients are nitrogen, phosphorus, and potassium.

Nitrogen is needed for the growth of leaves and stems whereas phosphorus is for the development of roots and blooms, and potassium is for overall plant health.

Hydrangeas that are thriving and healthy only require a balanced fertilizer with low concentration and equal NPK values. However, if you want to improve the flowering of your hydrangeas then you can use a fertilizer with higher phosphorus content like a 15-30-15 ratio.

It is important to pick the right type of fertilizer for your hydrangeas. Organic fertilizers like compost, manure, and bone meal are excellent choices for hydrangeas because they release nutrients slowly over time and improve soil structure.

Also Read: Is Bone Meal Good for Hydrangeas?

How Coffee Grounds Benefit Hydrangeas?

Coffee grounds are a great organic fertilizer for hydrangeas as they offer several benefits to these stunning flowering plants. 

First, coffee grounds provide a natural source of nitrogen, a vital nutrient for plant growth. The nitrogen in coffee grounds promotes leafy growth, which is crucial for hydrangeas.

Another benefit of coffee grounds is their ability to help maintain soil acidity. Hydrangeas need acidic soil and coffee grounds can help lower the pH level of the soil. The acidity of coffee grounds can also enhance the colour of hydrangeas to blue.

Also from providing nutrients and maintaining soil acidity, coffee grounds can also improve soil texture and water retention. They help to loosen compact soil and promote water absorption, ensuring that your hydrangeas receive adequate moisture and nutrients.

While coffee grounds offer many benefits to hydrangeas, they should be used in limited. Excessive use of coffee grounds can make the soil too acidic, which can lead to stunted growth and yellowing of the leaves.

Do Hydrangeas Like Coffee Grounds?

If you’re a coffee lover, you may be thinking if there are any ways to reuse your used coffee grounds and take advantage of their benefits once again. Then yes! You can use it in your Hydrangeas plant and they like it.

Coffee grounds provide a natural source of nitrogen, which is good and vital for plant growth. Nitrogen promotes leafy growth, which is crucial for hydrangeas to produce stunning blooms.

Moreover, nitrogen in coffee grounds also contains elements like magnesium, copper, and calcium, which are essential for plants.

Furthermore, coffee grounds help maintain soil acidity. Hydrangeas need acidic soil to grow and can change the colour of Hydrangeas blooms to blue. With pH level of the soil, makes it more acidic and creates the ideal growing conditions for your hydrangeas.

But keep in mind that using it so much can harm your plant. Use coffee grounds in moderation, no more than once a month, and always mixed with other organic materials like compost.

How to Use Coffee Grounds on Hydrangeas?

Using coffee grounds on hydrangeas is an excellent way to provide them with natural nutrients and help maintain soil acidity. Also, use them correctly to avoid overuse or misuse. Here are some tips on using coffee grounds on your hydrangeas –

1. Use used coffee grounds

First, make sure your coffee grounds are used, not fresh. Fresh coffee grounds are acidic and can damage your hydrangeas. Used coffee grounds are neutral and safe to use.

2. Mix with other organic materials

Next, mix the coffee grounds with other organic materials such as compost. This helps balance the acidity and ensures your hydrangeas get a mix of nutrients. A good ratio is one-part coffee grounds to three-parts organic material.

3. Apply the mixture to the hydrangeas

When applying the mixture to your hydrangeas, sprinkle it around the base of the plant and lightly rake it into the soil. Be careful not to apply too much, as excessive use can make the soil too acidic and harm your hydrangeas.

It’s also necessary to use coffee grounds carefully, no more than once a month. Too much of a good thing can be harmful, so it’s best to be cautious.

Check this out: Do Hydrangeas Like Clay Soil?

How Often to Put Coffee Grounds on Hydrangeas?

You don’t need to apply coffee grounds to your hydrangeas too frequently. In fact, applying coffee grounds two to three times per year should be enough to provide your hydrangeas with the nutrients they need. 

coffee grounds are acidic, so first monitor your soil pH levels. If you notice that your soil pH is becoming too acidic, reduce the frequency of coffee ground applications.

Your hydrangeas will give you a clue as to whether they’re receiving too much or too little coffee grounds. If you notice yellowing leaves or stunted growth, it may be a sign of overuse. If you notice healthy growth and blue vibrant blooms, you’re likely using the right amount.

How to Make Hydrangeas Blue with Coffee Grounds?

If you want to give your hydrangeas a blue colour, you can use coffee grounds to lower the soil pH levels. To do this, start by collecting used coffee grounds and spreading them around the base of your hydrangeas.

Be sure to avoid piling the coffee grounds too high against the stem to prevent rotting. The acidity in the coffee grounds will slowly seep into the soil and lower its pH levels, resulting in blue blooms.

However, using coffee grounds to turn hydrangeas blue may not have an immediate effect. It may take some time for the soil pH to change and for the flowers to change colour. With some patience and care, you can grow blue hydrangeas in no time.

(Read on this: Are Eggshells Good for Hydrangeas?)

Can You Change the Color of Hydrangeas With Coffee?

yes! Coffee grounds can be used to change the colour of hydrangeas, but the method and outcomes can vary depending on the type of hydrangea you have.

For blue hydrangeas, you can use coffee grounds to lower the pH levels of the soil and produce a more acidic environment. This allows the plant to take up more aluminium from the soil, which results in blue blooms. 

On the other hand, pink hydrangeas need more alkaline soil with higher pH levels. Adding coffee grounds to the soil of pink hydrangeas can actually inhibit their ability to absorb aluminium, resulting in pinker blooms.

Coffee grounds for flowering plants

Coffee grounds are not only beneficial for hydrangeas but also for many other flowering plants. They contain essential nutrients that are beneficial for plant growth and flowering. Coffee grounds are rich in nitrogen, phosphorus, and potassium, which are necessary for flowering plants.

When used as a fertilizer, coffee grounds help to enhance soil structure and encourage healthy root growth, which in turn leads to healthy plant growth and better flowering. 

What are the disadvantages of coffee grounds as fertilizer?

  • High acidic – Coffee grounds are acidic, and excessive use can lead to a decrease in the pH level of your soil. This can negatively affect the growth of your plants and make it hard for them to absorb other essential nutrients.
  • Slow decomposition – Coffee grounds take a long time to decompose, which means the nutrients they hold may not be quickly available to your plants.
  • Nitrogen content – While coffee grounds are a good source of nitrogen, they also contain other elements like potassium and phosphorus that are required in smaller quantities. Using coffee grounds as the only source of fertilizer may lead to an imbalance of nutrients in the soil. Which can further harm your plants.
  • Attract pests – Coffee grounds can attract pests like slugs and snails, which can damage your plants. Be sure to check your garden closely and take action to control any pests that you may face.
  • Limitations for certain plants – Not all plants thrive in acidic soil, and using coffee grounds as fertilizer may not be suitable for certain plants like tomatoes and peppers. Before using coffee grounds on your plants, research their specific needs and make sure they will benefit from this type of fertilizer.

Hydrangeas Plant Growing Tips

Here are some tips to grow hydrangeas beautifully – 

Choose the right location – Hydrangeas prefer well-draining soil that is rich in organic matter. They also like partial shade, so avoid planting them in direct sunlight.

Water regularly – Hydrangeas need regular watering to keep their soil moist, especially during hot and dry weather.

Fertilize carefully – Hydrangeas need specific nutrients to thrive. Use a low-concentration, balanced fertilizer with equal NPK values to provide the necessary nutrients. Also, you can use coffee grounds as a fertilizer by mixing it with other materials too.

Pruning – Prune your hydrangeas at the right time to promote healthy growth and beautiful blooms in no time. For most varieties, prune in late winter or early spring before new growth appears.

Protect from pests and diseases – Hydrangeas can be susceptible to pests and diseases like aphids, powdery mildew, and spider mites. Always check your plant for any signs of trouble and take proper action to protect your plants.

Mulch around the base – Adding a layer of mulch around the base of your hydrangeas can help retain moisture in the soil and keep the roots cool.

Climate – Different hydrangea varieties thrive in different climates. Be sure to choose a variety that is well-suited to your region to give your plants what they need.

Also Read: Can I Put My Potted Hydrangea Outside?


Hydrangeas are beautiful and popular plants that need not so much care to thrive. Coffee grounds can be a useful addition to your hydrangea care routine, but its when you use them correctly. 

As above mentioned, coffee grounds can provide hydrangeas with important nutrients, help maintain soil pH levels, and even change the colour of the blooms.

However, using too many coffee grounds can lead to negative effects, such as root burn and stunted growth. Be careful and avoid overuse. Happy gardening!