Can You Mix Ericaceous Compost with Normal Compost?

This is a question frequently asked by gardeners and farmers.

It’s important to understand the unique properties of each type of compost and how they can work together to create healthy soil that encourages plant growth.

Composting is essential for maintaining sustainable agriculture practices, so understanding the benefits of mixing different types can be beneficial in creating an optimal environment for plants.

The Secret to a Thriving Garden: Mixing Ericaceous and Normal Compost

Ericaceous compost, also called acid compost, is perfect for growing plants that prefer acidic soil with a pH level between 4.5 and 5.5, such as azaleas, rhododendrons, and blueberries.

On the other hand, you can use normal compost to grow various plants due to its general-purpose nature.

What are the differences between ericaceous compost and normal compost?

Ericaceous compost is composed of peat, bark, and other acidifying materials that lower the pH level in the soil.

However, normal compost consists of organic material such as kitchen scraps, yard waste, and manure, which do not have acidic properties like ericaceous compost.

Is it possible to mix ericaceous compost with normal compost?

Yes, it is possible to mix ericaceous compost with normal compost.

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Ericaceous (low pH) soil amendments are used for plants that prefer acidic growing conditions and can be combined with other types of soils or potting mixes for a more beneficial result.

To make a simple potting soil specifically suited to such acid-loving species, combine half peat moss and equal parts perlite, regular garden soil, sand, and organic matter like manure or general purpose/multipurpose composter in the ratio 10:10:20:10 respectively.

However, remember that mixing a multipurpose ‘normal’ type of composter into an ericaceous one will increase its alkalinity due to the lime content present – so if this isn’t desired, then avoid adding too much of this kind!

What are the implications of mixing ericaceous compost with normal compost?

Mixing ericaceous compost and regular compost can benefit certain plants as long as it is done in moderation.

The acidifying properties of the former could improve soil pH levels if used cautiously. It is essential to consider these implications before doing so.

Advantages of Mixing Ericaceous Compost with Normal Compost

The benefits of combining ericaceous compost with regular soil are numerous.

Doing so creates a balanced environment for many plants to thrive.

Here we will discuss the pros and cons of this combination and provide some key points to consider before making the mix.

1. Balancing Soil pH

Adding ericaceous compost to neutral soil can help balance the pH level, creating a more suitable environment for acid-loving plants like azaleas, rhododendrons, and blueberries.

Mixing ericaceous with regular compost allows you to create an optimal growing space for these plants.

2. Improving Soil Structure

Mixing ericaceous compost with normal compost can enhance the structure of the soil.

Ericaceous compost is usually rich in organic material, which aids in increasing the water and nutrient retention capacity of the dirt.

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This amendment benefits both acid-loving plants and those that thrive on neutral soils.

3. Enhancing Nutrient Availability

By combining ericaceous compost with regular compost, you can improve the availability of important nutrients such as iron, zinc, and manganese for your garden plants.

These essential elements are vital for plant growth and development.


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Disadvantages of Mixing Ericaceous Compost with Normal Compost

When considering whether to mix ericaceous compost with normal compost to create a balanced soil environment for acid-loving plants, it is important to be aware of potential drawbacks.

Below are some key points to consider before making this decision:

1. Incorrect pH Level

It is essential to frequently check the soil pH level and modify the ratio of ericaceous compost to regular compost if necessary to stop an overly acidic environment from forming, which can be damaging for neutral plants.

2. Over-Fertilization

Adding too much ericaceous compost to normal compost can cause over-fertilization, which is harmful to plants as it could burn their roots or lead to other damage.

Ericaceous compost contains high levels of nitrogen, phosphorus, and potassium, which are essential nutrients, but in excess amounts, they can be damaging.

3. Limited Use

Ericaceous compost should be used sparingly, as it benefits certain acid-loving plants.

Still, it may not be necessary or harmful to neutral and alkaline-loving plants such as tomatoes, cucumbers, and herbs.

The Royal Horticultural Society conducted a study that revealed that combining ericaceous compost with ordinary compost can raise the soil’s pH level.

Consequently, it is essential to be cautious when mixing these two kinds of compost and frequently test the soil pH level to maintain it within an ideal range for your plants’ growth.

Creating the Perfect Soil Mix: How to Mix Ericaceous Compost and Normal Compost

It is easy to mix ericaceous compost with regular compost.

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Still, it is important to follow the right proportions and steps for the combination to be balanced and effective.

1. Determine Proportions of Compost

To ensure the best possible results for your plants, you should determine the desired proportions of ericaceous and normal compost.

As a starting point, use one part ericaceous compost to three parts normal compost.

However, this ratio may need to be adjusted depending on what kind of plants are being grown and the soil pH level.

To ensure optimal growing conditions, you must regularly test your soil’s pH levels and adjust the ratio accordingly.

2. Mix Two Types of Compost

Combine the two types of compost to create a uniform mixture.

Use a garden fork or trowel to thoroughly blend them in a large container or directly into the soil.

This will ensure an even distribution of acidity and neutrality throughout your soil for optimal growth and health benefits.

3. Ensure the Mixture is Well Drained

When adding the mixture to your soil, ensure it is properly drained.

Plants with more acidic needs should incorporate the mixture closer to their roots, while those preferring neutral soils can be placed further away from them.

Additionally, ensure that you do not compact the mix when incorporating it into your soil, as this may cause waterlogging and damage plants.

In summary, Mixing ericaceous compost with normal compost can be a great way to achieve an ideal soil environment for many plants.

However, it is important to consider the unique characteristics of each type of compost and frequently check the pH level of your soil to keep it within the desired range for your specific plants.

You can ensure that this mixture is balanced and efficient with proper proportions and techniques.

In summary, mixing these two types of compost can yield positive results if done correctly.


  1. Royal Horticultural Society. (2021). Ericaceous Compost –
  2. What is Ericaceous Compost (Things you Need to Know) ( –



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