Can I Compost Onions? What You Need To Know!

Composting is a wonderful way to create organic and natural fertilizer to use in your yard. Whilst it is attainable to compost several varieties of veggies, what about onions?

Several folks think onions are not compostable because of the sturdy odor. Even so, you can compost onions because they are greens. The only stage to observe is the strong, pungent smell, which can turn into a nuisance soon after some time.

Nonetheless, if you forget that, you can make some top quality natural and organic fertilizer when you compost onions. This write-up demonstrates you how to compost onions and a few tricks for the ideal results.

Role of Onions in Compost

Onions are vegetables that folks use in the kitchen area virtually every day. They are valuable not only in cooking but for a lot of other reasons, these kinds of as composting.

Nonetheless, just before adding onions to your compost, take into account the smell. Onions are identified to be some of the most pungent veggies. If

the odor is not an problem, then it’s really okay to insert onions to your compost pile. This provides to the inexperienced squander that you require for healthy compost.

Note that onions have a minimal pH, producing them very-acidic greens. So, contemplate the pH amount of your compost when adding them. These can be wonderful when you want to hold off composting because they will slow down the composting microorganisms and other grubs.

Also, onions can assist you equilibrium out your compost in a all-natural way. Offered that most compost tends to be alkaline, including onions that are extremely acidic provides you a excellent equilibrium. Nonetheless, make certain you do not insert too numerous onions in one heap.

compost bin with cardboard
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Should I Compost Whole Onions or Peels?

Total onions are great to insert to the compost. Nevertheless, it is greater to incorporate peels. Remember, complete onions usually create shoots. Also, due to the fact of the dimension, these can just take lengthier to decompose.

The more compact the pieces, the more rapidly onions decompose into the compost

Are Moldy Onions Good for Compost?

Do you have some onions that have been in your kitchen so prolonged that mildew has began expanding? Are you thinking about adding these moldy onions to your compost pile? Well, you can go correct in advance.

Moldy onions aren’t best for cooking, but they’re exceptional for the compost pile. When you start to see mildew forming on the onions, know that the process of decomposition has presently begun. So, including them to the compost makes feeling simply because decomposition is the total position.

It is not unusual to discover mould developing inside of your compost bin. This is a indicator of natural decomposition getting location. Therefore, tossing in the moldy onions indicates one particular product is already on its way to getting to be wholesome compost.

Are all onions suitable for the compost bin?

Which Type of Onions Should Never End Up in the Compost?

When composting distinct products, observe that not everything is intended for the compost bin. For instance, if you come throughout some diseased onions in a batch, by no means incorporate them to the compost bin.

Diseased onions and other diseased vegetation can infect your compost. This is poor simply because the illness gets transferred to your vegetation when you use the compost in your garden.

Some widespread onion ailments consist of white rot, mildew, and leaf blight. When you detect any of them, toss individuals onions in the rubbish bin. It’s far better not to risk the health of your compost and plants, so steer clear of diseased onions at all costs.

In addition, it is far better not to include any cooked onions that you have left above in the kitchen area. When cooking onions, you are most very likely using oils or fat. When you incorporate these onions to the compost, it’s difficult for the oils and fats to break down.

Also, cooked foods in the compost tends to appeal to pests, like rats. When rats assault your compost, you won’t like the mess that these rodents create. In addition, rat droppings have conditions, which can transfer to your compost and then to your yard beds.

compost bin with food scraps and grass cuttings
Image Credit: Anna Hoychuk, Shutterstock

How to Compost Onions

Composting follows several measures to get the best final result. Even so, one particular rule is to constantly compost more compact chunks of each material you insert. If you use heaps of greens, make confident you chop them up. The exact same applies to the brown substance you use in your compost.

Smaller sized matter requires a shorter time to decompose, in contrast to massive chunks. 1 critical factor to know is that you should by no means insert onions when vermicomposting. The worms will not split down the onions offered the pungent odor they emit.

Here are the steps to follow when composting onions:
  • Pick your composting spot in your yard or home. Keep in mind that composting takes time, so don’t pick an area that you want to use in the near future. A corner in the yard can be the best spot to start your compost heap.
  • Get a composting bin that will fit the amount of matter you want to add. There are specific composting bins that you can buy. After that, use a drill to create about five holes in the bin. Space out the holes from top to bottom randomly so that these permit as much air circulation as possible.
  • Gather the onions and chop them into smaller pieces for faster decomposition. If not, you can unpeel the onions and slice the peels. Chopping is also an effective way of ensuring the onions don’t start bearing new shoots while in the compost bin.
  • Use some cardboard or newspaper as part of the brown material. These two are excellent for controlling the pungent smell of onions. Cardboard and newspapers do decompose, so they are excellent additions to the compost pile.
  • Add the onions into the compost bin and bury them deep. You can add other vegetables and brown materials to create the best compost. Also, remember to pour some water on the compost piles at each level to assist with decomposition.
  • Keep turning the compost and add soil to it. You can do this once a week while also inspecting the state of the compost.
  • When the compost is ready, you can add it to your plants or soil. The compost will start feeding your plants with lots of nutrients slowly. If plants are already growing, it’s a great top-dressing material to keep them healthy and productive.

Even with the step-by-step approach, there are some ideas that can help you develop the best onion compost.

The 6 Tips for Composting Onions Are:

1. Have a Balance of Greens and Browns

The greatest way to generate compost is by having green and brown substance. When one particular lacks, it’s not possible to get healthy compost. When you want to decompose onions, ensure you have an equivalent amount of cardboard, newspaper, or other brown materials.

hand holding compost material over the compost pit
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2. Keep an Eye on the Fungi Levels

Fungi is crucial for decomposition, but it can also stimulate mushroom development. While this is not way too poor, always notice that some mushrooms are poisonous. So, you can prevent this growth by guaranteeing there is proper airflow in the compost bin.

3. Bury Onions Deep to Control the Smell

Onions have a strong scent. If you want to manage this, bury the onions about 12 inches deep in the compost pile. On best of the onions, incorporate brown supplies, like newspapers and cardboard. As you change the compost, enough airflow is also best for managing the powerful odor.

4. Avoid Glossy Paper

Glossy paper, like the paper from publications, is very good for crafts and other needs at property. Nonetheless, you should by no means use it as part of the brown materials in a compost bin. The coatings and hues in glossy paper are toxic and make your compost unhealthy.

hand holding a compost in heart shape
Image Credit: Jerome.Romme, Shutterstock

5. Remove Labels and Wrappers

If your onions have labels or if they come in a plastic web, remove the two prior to incorporating them to the compost pile. The plastic netting and labels are not biodegradable, not unless of course it’s said on the label. The small stickers are easy to miss out on, so make certain you appear at all the inexperienced issue before incorporating it to the compost bin.

6. Use a Bin With a Lid

Open up compost piles are fantastic, but a single problem you may experience is dealing with pests. Rodents enjoy to feast on the kitchen area scraps in a compost pile. This can cause a massive mess and even impact the good quality of your compost. So, it is better to commit in a top quality composting bin with an effective lid.


Onions are component of the green issue that you can incorporate to your compost pile. These veggies do have a foul odor, but they can do a good deal of good for your compost. Since most compost is alkaline, the extremely acidic onions help to stability the pH levels in the pile.

If you have some moldy onions, toss them into the compost as well. Nevertheless, steer clear of onions with illnesses or these that are cooked with oils or fat. Diseased onions in the compost can infect your crops later. As for cooked onions, it is tough for the oils and fats to decompose.

Now you know that onions are best for composting, so do not wait to incorporate them.



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