Composting With Eggshells: Benefits and How-to Guide

Composting is a great way to reduce waste, enhance soil quality, and create a more sustainable home and garden.

In this blog post, I’ll be sharing with you the benefits of using eggshells in your compost, as well as a quick guide on how to incorporate them into your composting practices.

By the end of this post, you’ll learn how to make your garden thrive by providing essential nutrients, balancing pH levels, increasing soil porosity, and reducing your waste.

So, let’s get started and learn how composting with eggshells can take your garden to the next level!

Benefits of using eggshells in composting

If you are looking for an organic, low-cost way to improve your garden’s soil, then composting with eggshells is a great option. Here are some benefits of using eggshells in your compost:

Provides essential nutrients

Eggshells are an excellent source of calcium and other essential minerals that plants need to grow. When added to your compost, they break down slowly, releasing these nutrients over time.

Balances pH levels

If your soil is too acidic, it can be difficult for plants to absorb nutrients. Eggshells are alkaline, which can help to balance the pH levels in your soil and make it more plant-friendly.

Increases soil porosity

Eggshells can also help to improve soil porosity, which is a measure of how well water and air move through soil. When added to compost, eggshells break down and create small channels that allow water and air to penetrate deeper into the soil.

Reduces waste

By using eggshells in your compost, you can reduce the amount of waste that goes to the landfill. Eggshells are biodegradable and can be recycled back into the earth.

Overall, composting with eggshells is an easy and effective way to improve the health of your garden soil while reducing waste.

Preparing Eggshells for Composting

Before adding eggshells to your compost heap, it’s important to prepare them to ensure they break down quickly and efficiently. Here are the steps to follow:

Cleaning and Drying Eggshells

The first step is to wash the eggshells with water to remove any remaining egg residue. Be sure to remove the inner membrane, as it takes much longer to decompose. Allow the eggshells to dry completely, either by laying them out on a towel overnight or baking them in the oven at a low temperature (about 200°F) for around 10 minutes.

Methods for Crushing or Grinding Eggshells

Once the eggshells have been cleaned and dried, they need to be crushed or ground to make them easier to decompose. There are several methods for doing this:

  • Mortar and pestle: This is a quick and simple way to crush eggshells. Just add the eggshells to the mortar and use the pestle to grind them into small pieces.
  • Blender or food processor: Another option is to use a blender or food processor to grind the eggshells into a powder. This method is best for larger quantities of eggshells.
  • Rolling pin: If you don’t have a mortar and pestle or a blender, you can place the eggshells in a plastic bag and use a rolling pin or other heavy object to crush them.

Remember, the finer you grind the eggshells, the faster they will decompose. But don’t worry if you can’t get them completely powdered - even small pieces can provide the benefits of eggshells in composting.

Adding Eggshells to the Compost

When it comes to adding eggshells to your compost, there are some best practices to keep in mind. First, it’s important to clean and dry eggshells before adding them to your compost bin. This will help to prevent any unwanted odors and pests from forming in the bin.

Once your eggshells are clean and dry, you can add them to your compost bin. It’s a good idea to mix them in with other organic materials, such as food scraps and yard waste. This will help to create a well-rounded compost mixture that is full of nutrients for your plants and soil.

It’s also important to use the correct ratios of eggshells to other materials, as adding too many eggshells at once can cause the compost to become too alkaline. A good rule of thumb is to aim for a ratio of about 5% eggshells to 95% other materials.

By following these best practices, you can ensure that your eggshells are effectively incorporated into your compost mixture and are providing all the benefits they have to offer.

Composting process with eggshells

After adding eggshells to your compost pile, they will break down over time and contribute to creating nutrient-rich soil. It’s important to note that eggshells decompose slowly, so it’s best to crush or grind them before adding them to the compost. The finer the eggshells are, the faster they will decompose.

The composting process typically takes around 2-6 months, depending on the type of composting method and the materials being used. During this time, the compost pile should be turned every few weeks to ensure proper aeration and to help the materials decompose evenly.

As the eggshells break down, they release calcium and other essential nutrients into the soil. This helps to promote plant growth and overall soil health. Additionally, the high calcium content in eggshells can help to balance the pH level of the soil, which is important for many types of plants.

It’s important to note that composting with eggshells is just one small part of the process. To create high-quality compost, you should also be adding a variety of other organic materials, such as vegetable scraps, grass clippings, and leaves. A good rule of thumb is to aim for a ratio of roughly 3 parts brown material (leaves, paper, etc.) to 1 part green material (vegetable scraps, grass, etc.).

If you’re using a traditional backyard composting method, it’s important to pay attention to the compost pile temperature. The optimal temperature range for the composting process is between 110-160°F (43-71°C). If the temperature drops below this range, the composting process can slow down significantly, and if it rises above this range, it can kill off the beneficial microorganisms that are responsible for breaking down the materials.

By monitoring the temperature and keeping a good balance of materials, you can create nutrient-rich soil that will help your plants thrive. And by using eggshells in your compost pile, you’re not only reducing waste, but also helping to create a sustainable and eco-friendly garden.

Common mistakes to avoid when composting with eggshells

When composting with eggshells, there are some common mistakes that should be avoided. First, adding too many eggshells at once can be problematic. Eggshells take longer to break down than some other organic materials, and adding too many at one time can throw off the balance of the compost. It’s best to add a small amount of eggshells at a time and let them break down before adding more.

Another mistake to avoid is incorrectly crushing or grinding eggshells. Eggshells should be crushed or ground into small pieces to help them break down more quickly. However, if they are not crushed or ground enough, they may take longer to break down or not break down at all. It’s important to crush or grind the eggshells until they are small enough to break down easily.

Finally, not balancing the pH levels in the soil can be a mistake when composting with eggshells. Eggshells are alkaline, which means they can increase the pH levels of the soil. If the soil is already too alkaline, adding eggshells can make the problem worse. It’s important to test the soil pH levels regularly and add materials like coffee grounds or pine needles to balance the pH levels if necessary.

By avoiding these common mistakes, you can ensure that your eggshell composting is successful and efficient.

Alternative Uses for Eggshells in Gardening

If you are not interested in including eggshells in your composting practice, there are several other ways they can be used in your garden.

Adding Directly to Garden Soil

One of the easiest ways to use eggshells in gardening is to add them directly to your garden soil. Crushed eggshells can be spread around the base of plants to improve soil drainage and add calcium to the soil. The calcium in eggshells is particularly beneficial for plants like tomatoes, peppers, and eggplants, which are known for developing calcium deficiencies.

DIY Eggshell Fertilizers

Another way to use eggshells in your garden is by making your own fertilizer. To do this, grind eggshells into a fine powder and mix them with coffee grounds, which are rich in nitrogen. This fertilizer can be used to replenish nutrients in your garden soil and improve plant growth.

Pest Control Methods Using Eggshells

Eggshells can also be used to control pests in your garden. Crushed eggshells can be spread around the plants to create a barrier that pests like slugs and snails will not cross. The sharp edges of the eggshells are uncomfortable for pests to crawl over, and can help protect your plants from damage.

By using eggshells in your garden, you are not only reducing your waste but also providing important nutrients for your plants.

Different Types of Composting Methods That Incorporate Eggshells

If you’re interested in composting with eggshells, you may be wondering which type of composting is best for you. There are several methods to choose from, including vermicomposting, bokashi composting, and traditional backyard composting. Each has its own benefits and drawbacks, so it’s important to choose the right one for your needs.


Vermicomposting is the process of using worms to break down organic material into nutrient-rich soil. If you’re looking for a way to compost indoors, vermicomposting is a great option. By adding eggshells to the worm bin, you can help balance the pH levels and provide essential nutrients to the worms. The worms will also help break down the eggshells, making it easier for you to incorporate them into your garden soil.

Bokashi Composting

Bokashi composting is a fermentation process that uses a special mixture of microorganisms to break down organic matter. In this method, you add a small amount of bokashi mix to organic waste, such as eggshells, in an airtight container. The mixture helps accelerate the breakdown process, and after a few weeks, the bokashi compost can be added to your garden soil. Bokashi composting is a great option for those who want to compost indoors and have limited space.

Traditional Backyard Composting

Traditional backyard composting is a natural process of breaking down organic materials, such as eggshells, in a bin or pile. This method requires the right balance of carbon-rich materials, such as dried leaves and straw, and nitrogen-rich materials, such as food scraps and eggshells. By adding eggshells to your compost pile or bin, you can provide essential nutrients to the soil and help balance the pH levels. This method is great for those who have a backyard and want to create their own compost.

No matter which method you choose, composting with eggshells is a great way to reduce waste and create nutrient-rich soil for your garden. Experiment with different types of composting to find the one that best fits your lifestyle and needs.

Final Thoughts

In conclusion, composting with eggshells is an easy and effective way to enrich your soil and reduce waste.

Incorporating eggshells into your composting routine can help you grow a healthier garden and improve the health of our planet.

But with any new gardening practice, it is important to do your homework to make sure you are doing it safely and correctly.

So, which method of incorporating eggshells will you try first?

I’d love to hear your thoughts and experiences with incorporating eggshells into your composting routine.

If you found value in this post, please share it on social media to help spread the word about the benefits of composting with eggshells.

Author: Scott Sanders


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