The Benefits of Using Eggshells for Compost: A Complete Guide

Are Eggshells Good for Compost?

Composting is an eco-friendly way to reduce waste and create nutrient-rich soil for gardening. As you embark on your composting journey, you may wonder if eggshells can be a valuable addition to your compost bin. In this article, we’ll explore the benefits of using eggshells in your compost, how to prepare them properly, and some tips for incorporating them into your composting routine. So let’s dig in!

The Benefits of Using Eggshells in Compost

1. Nutrient Boost: Eggshells are primarily composed of calcium carbonate, which is essential for plant growth. Adding crushed eggshells to your compost pile enriches it with calcium, promoting healthier plants with stronger cell walls.

2. pH Balancing: While many organic materials like fruit peels and coffee grounds can make your compost acidic over time, adding eggshells helps balance the pH levels due to their alkaline nature. This ensures that the decomposition process remains optimal.

3. Pest Deterrent: The sharp edges of crushed eggshells act as a natural deterrent against slugs, snails, and other garden pests that dislike crawling across rough surfaces. Incorporating these shells into your garden beds can help protect delicate seedlings from being nibbled upon.

Preparing Eggshells for Composting

Properly preparing eggshells before adding them to the compost heap ensures they break down efficiently.

1. Start by rinsing empty eggshell halves under cool tap water to remove any residual traces of protein or yolk.

2. Allow them to air dry completely – placing them on a drying rack or windowsill works well.

3. Once dry, gently crush or grind the shells into small pieces. This step helps speed up decomposition and makes it easier for microorganisms to break them down.

4. Remember, eggshells are mostly composed of calcium carbonate, so don’t worry about removing the thin membrane lining the inside of each shell as it will decompose naturally.

Tips for Using Eggshells in Composting

1. Moderate Quantity: While eggshells offer several benefits, they should be added in moderation to maintain a balanced compost pile. Too many eggshells can alter the pH levels excessively or slow down decomposition due to their high calcium content.

2. Crushing is Key: Before incorporating them into your compost heap, ensure you crush or grind the eggshells adequately. Smaller pieces decompose faster and are easier for microbes to break down effectively.

3. Layering Technique: To maximize the benefits of using eggshells within your compost, consider layering them with other organic materials like fruit peels and yard waste rather than adding them all at once.

4. Mix It Up: Regularly turn or mix your compost pile to help distribute crushed eggshell particles evenly throughout, ensuring they integrate well with other ingredients in the process.

5. Patience Pays Off: Remember that composting takes time – usually several months – before it transforms into nutrient-rich soil ready for use in your garden beds.


In conclusion, incorporating crushed eggshells into your compost is a fantastic way to enrich its nutrient content while balancing pH levels naturally and deterring pests from ravaging your plants’ leaves and stems. By properly preparing and adding them in moderation alongside other organic materials, you’ll contribute towards creating healthy soil that supports robust plant growth without any harmful chemicals or additives.
Happy composting!