Should you put eggshells in compost?
Noah Mitchell
Published Jan 07, 2026
A common question is can you put eggshells in compost heaps? The answer to this is yes, you can. Adding eggshells to compost will help add calcium to the make up of your final compost. This important nutrient helps plants build cell walls.
What should you not put in compost?
What NOT to Compost
- Meat and Fish Scraps. ...
- Dairy, Fats, and Oils. ...
- Plants or Wood Treated with Pesticides or Preservatives. ...
- Black Walnut Tree Debris. ...
- Diseased or Insect-Infested Plants. ...
- Weeds that Have Gone to Seed. ...
- Charcoal Ash. ...
- Dog or Cat Waste.
Are egg shells bad for compost?
Let's just start out by saying: putting egg shells in your compost is okay; they are a rich source of calcium and other essential nutrients that plants need.
How long do egg shells take to compost?
How long does it take for an eggshell to decompose? Eggshells take more than 3 years to break down. In an eggshell decomposition study, the outer shell was found intact after a year underground.
Are eggshells and coffee grounds good for compost?
Both coffee grounds and egg shells are incredible for a compost pile. The nitrogen in the coffee can actually help heat the pile. And as both break down, they leach their vital nutrients into future compost.
41 related questions foundHow do you mix eggshells in soil?
Eggshells encourage root growth.
Simply crush clean, dry eggshells into a fine powder. Add the powdered eggshells to boiling water, then cover and store the mixture for one week, uncovering it only once daily to stir it. After seven days, pour the mixture directly into the soil above the plant's roots.
How do I prepare eggshells for my garden?
To prep the eggshells, grind with a mixer, grinder, or mortar and pestle and till them into the soil. Because it takes several months for eggshells to break down and be absorbed by a plant's roots, it is recommended that they be tilled into the soil in fall. More shells can be mixed into your soil in the spring.
Do you wash eggshells before composting?
While you don't need to crush eggshells before composting them, doing so will speed up how fast the eggshells break down in the compost. You also may want to consider washing your eggshells before composting them so that you do not attract animals, as well as reducing the slight risk of disease which raw eggs pose.
Can banana skins be composted?
Composting banana peels is as easy as simply tossing your leftover banana peels into the compost. You can toss them in whole, but be aware that they may take longer to compost this way. You can speed up the composting process by cutting up the banana peels into smaller pieces.
Can you add coffee grounds to compost?
Adding Coffee Grounds to Your Compost
In short, the answer to “Can you put coffee grounds in compost?” is yes. Not only can you add coffee grounds to any composting setup, but you should. Coffee grounds are beneficial for your soil, and they're one of the easiest food wastes to compost.
Can bread be composted?
To conclude, yes, you can compost bread! After all, bread is organic matter. If you have any bread lying around that may otherwise go to waste, go ahead and compost it. Best of all, bread scraps break down just as rapidly as other food scraps in your Lomi bin.
Do eggshells in compost attract rats?
Eggshells are also said to attract rats they differ from the other materials that are normally composted having a high mineral content rather than being wholly organic. Therefore, they are a good source of calcium, on average 2.2 grams for each dry eggshell.
What do I put at the bottom of my compost bin?
Almost everyone advises putting down a layer of coarse material — corn cobs and husks, sticks, thick fibrous stalks from vegetables or tall flowers. This layer improves aeration at the bottom of the compost pile.
Should you compost onions?
You can compost onions peels and skins but not whole bulbs because they can easily regrow in your garden. They help increase the organic matter, nutrients, and acidity of the compost. The best way to compost onions is to chop them into small pieces before adding them to your composting bin.
Can I put tomatoes in my compost?
Yes! Yes, you can compost tomatoes – they're essentially little balls of water and rot down very quickly – but do keep in mind that the seeds may germinate the following spring, potentially leading to rogue tomato plants in your compost heap or flower beds.
Can I put newspaper in my compost?
Except for colored and glossy paper, which might contain some toxic heavy metals, newsprint and other paper is safe to use as mulch or in compost. In fact, one study revealed that paper had less toxic material than straw or grass!
Can you compost paper towels?
The benefits of this program include reducing paper waste from landfills, improving texture and fertility of soil, and creating new jobs in recycling facilities. Paper towels free of chemicals can be composted, and the bacteria or food on them will break down during the composting process.
Can apple cores be composted?
Anybody who has a composting bin or compost pile at their house knows that old apple cores, banana peels, and potato skins can be composted. The list of compostable items doesn't stop there, in fact, it barely scratches the surface.
Can you compost scrambled eggs?
You can compost raw and cooked eggs safely in almost any composting method, provided you are only adding small amounts. For example, let's say you add a few tablespoons of scrambled eggs or a half-eaten fried egg into a hot or cold compost pile once in a while.
Are orange peels good compost?
Yes indeed! You can put orange peels into your compost mix. Citrus peels, which are high in nitrogen, can be used to increase the activity of microorganisms by being added to your compost. You can add lemon peels, grapes, lime peels, and other citrus peels to your compost pile as a nutrient.
Are egg shells brown or green compost?
Dried eggshells are not considered a brown or a green in composting because they are primarily mineral, not carbon or nitrogen. However, eggshells can have green material attached to them in the form of egg remnants or the fresh inner lining of the shell.
Can you put raw eggshells in garden?
Clean, dry eggshells can go directly into your compost, says Yvonne Savio, who worked as a master gardener coordinator for L.A. County and runs the website GardeningInLA.net. You also can put crumbled shells in the soil before you place plants or seeds.
Can I put eggshells in my plants?
Eggshells as all natural plant fertilizer
You don't have to use a commercial fertilizer on your plants. You can simply add crushed eggshells in or on the soil as a natural way of providing your indoor plants with extra calcium. Another advantage is that the eggshells will also help to aerate the soil.
Where do you put eggshells in the garden?
Using Eggshells to Prevent Blossom End Rot
- Eggshells used for the prevention of blossom end rot should be finely crushed or ground. ...
- Mix eggshells into the soil in the fall or at the end of the garden season to build calcium levels up for the following year. ...
- Apply more eggshells in the spring or at the time of planting.
What plants benefit from egg shells?
Which Plants Like Eggshells
- Tomato. Botanical Name: Solanum lycopersicum. Tomatoes thrive in nitrogen-rich soil, and eggshells help the soil to enrich with nitrogen and other minerals.
- Pepper.
- Eggplant.
- Broccoli.
- Spinach.
- Swiss Chard.
- Lettuce.
- Marigold.