Can You Compost Corn Cobs?

There are many things that can go in your compost bin. It’s not just for leftovers and other organic waste that can’t be thrown away any other way. Even if something doesn’t seem like it would break down easily, if it was alive at one point and is made of plant materials, you can probably compost it.

Although, there are some things that will keep your compost from working well. If you want to get the most out of your compost, you should avoid putting certain things in it.

If you’ve found yourself wondering “are corn cobs compostable?”, “how do I do it?” and “how long will they take to compost?”: you’ve come to the right place.

Can you put corn cobs in the compost?

Yes, corn cobs are compostable. Adding corn cobs to your compost pile will contribute to creating a nutrient-rich fertiliser that you can use in your garden.

Can you put them in the waste bin?

If you don’t have a compost bin, you can put vegetable scraps in the appropriate roadside collection bin but biodegradable materials like corn cobs are better off being in a compost pile.

Disposing of organic or compostable waste like vegetable scraps in landfill can contribute to the release of potent greenhouse gases like methane, which has around 80 times the warming power of carbon dioxide.

Methane emissions are significantly reduced by composting suitable food waste and organic materials.

How to compost corn cobs

You should chop them up into smaller pieces to help it decompose quicker.

As a green material, you should be adding corn cobs and other green nitrogen-rich materials then a layer of brown to cover it. Remember to use a garden fork or a stick to poke holes in your compost every couple of weeks to mix the pile up.

How long will corn cobs take to compost?

It takes around 4 months for corn cobs to completely decompose in a compost. Because they take a while to decompose, try not to add too many to your compost at the same time.

Corn cobs discarded on the ground or buried in the ground will take longer to decompose.

Are corn cobs a green or brown material?

Corn cobs should be considered a green material when composting.

Materials that are green, like corn cobs, are often more wet and softer recently-living organic material; and are a source of nitrogen (one of the four essential ingredients) for your compost. Green nitrogen-rich materials provide a lot of the vital nutrients that microbes need to speed up the process of decomposition. Ideally your compost mix should consist of about 1 part of green material for every 4 parts of brown material.

Composts rely on green materials like corn cobs to add the neccessary proteins and other nourishment for the microbes to thrive to the pile.

Will composting them attract pests?

No. Corn cobs will not attract pests.

Composting considerations

When composting corn cobs, you should add a splash of water with the corn cobs to add moisture and start the decomposition process quicker.

Omar Agor-Wood
Omar Agor-Wood

Omar is a digital marketer by day for one of the UK's largest environmental consultancy companies, and is writing like the world depends on it for Pick Ethical at night. He has a passion for hiking, bouldering, and making a fuss of his dog.

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