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The Daily Insight

How does a worm composter work

Author

Olivia Owen

Published Apr 15, 2026

Worm composting is using worms to recycle food scraps and other organic material into a valuable soil amendment called vermicompost, or worm compost. Worms eat food scraps, which become compost as they pass through the worm’s body. … This compost can then be used to grow plants.

How do you use a worm composter?

  1. Take the scraps to the worm bin.
  2. Gently use a trowel to create a hole to put the scraps into.
  3. Throw in a small handful of shredded paper.
  4. Add all the food scraps on top of the paper.
  5. Cover ALL of the food scraps with dirt and moist paper. …
  6. Notice what the worms are eating and what they are not.

How do you set up a worm compost bin?

  1. Fill worm bin with dry bedding material. (leaves, shredded paper, etc.)
  2. Add water (approximately 2-3 litres) and mix contents.
  3. Bedding should be the consistency of a wet sponge.
  4. Pour off any excess water. ( …
  5. Add more dry bedding or water as required.
  6. Add crushed eggshells/limestone and soil.
  7. Add the worms.

How long does it take worms to compost?

Worms Work FAST: Worms can convert most kitchen scraps to finished compost in less than two weeks. Worms Work ALL WINTER LONG: Keep a worm bin in your basement, garage or pantry (above 55 degrees and below 80 degrees F) and your worms will keep making compost right through the winter months.

Can I add worms to my compost bin?

Once you’ve got some red worms, you can easily add them to a closed bin or composting tumbler, but also an open bottomed compost bin. As long as they have plenty of organic waste for food they will thrive. Introduce them to your compost by gently spreading them out.

How often should you change worm bedding?

After worms are added, bedding should be kept moist but not soggy and the top 6 to 8 inches turned every 7 to 10 days to keep it loose. About every 6 to 9 months the old bedding should be replaced with properly prepared new bedding.

Can worms eat coffee grounds?

Worms love to eat coffee grounds, and that’s great news for your garden. Add coffee grounds to your compost pile to help attract worms, which help speed up the process of turning food scraps into compost.

What can I put in my worm compost bin?

The ideal diet for composting worms is non-acidic fruit and vegetable scraps. Grains, bread, coffee grounds, tea bags, and pasta are also fair game. Aged grass clippings, hair, and herbivore animal manure are compostable. Add shredded black-ink newsprint in moderation.

How often should I feed my worm bin?

Depending on the size of your bin, feed the worms from once a week to every two days with about a cup (240 ml.) of food. You may want to keep a journal regarding how quickly your worms consume certain things so you can adjust timings, amounts, and varieties. A stinky worm bin may be an indicator of overfeeding.

Do worms eat newspaper?

Shredded paper and cardboard, egg cartons, ripped up newspaper, receipts and envelopes should all be a regular part of the worms diet. LOTS of non-glossy paper should go in your worm farm – it is worth repeating!

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Can you use brown paper bags for worm bedding?

Worms will need bedding in their new home. … Worms love brown paper bags, uncoated newspaper, and even cardboard, as long as it’s shredded and moist. They will actually eat the paper in addition to the fruits, veggies and grains that you give them.

How cold can a worm bin get?

A Cold Worm Bin – When the temperature in a worm bin starts to drop below 60 degrees F, your worms will start eating less and reproducing less. As the temperature continues to drop they will go into survival mode. If the worm bin temperature drops below 40 degrees, the worms will start to die off.

Can worms eat cheerios?

Pureeing your table scraps will make them easier to eat, which means the worms will eat more of them! What about other kitchen scraps? Leftover cereal grains are great worm food. So are coffee grounds and tea leaves.

Why do worms like coffee grounds?

Since worms have no teeth, coffee grounds provide a gritty substance in their guts which helps them grind down foods. And the fine particle size of coffee grounds makes it easy for worms to consume. In addition, the fine particle size has a lot of surface area, which encourages bacteria to grow.

Can I use regular earthworms for composting?

The best kind of earthworms to use are red worms, also known as “red wigglers” and “manure worms”. These worms thrive in decomposing organic matter such as leaf piles, compost heaps and old manure piles. … Even a small bin of red worms will yield pounds of rich compost, also known as worm castings.

What is the difference between earthworms and red wigglers?

Red wigglers differ from earthworms in their aggressiveness, though they eat as much as the earthworms do. Red wigglers take their food on the soil surface; earthworms do not. Red wigglers are of immense help to gardeners, as they help decompose dead organic materials to humus, which adds to the fertility of the soil.

Can I feed my worms banana peels?

Bananas are a great and inexpensive snack for both us and our worms. Those peels are desirable to compost worms no matter what shape they’re in. They’ll make short work of what otherwise would have taken up space in your trash.

Can worms eat tomatoes?

Let’s dive in! *Tomatoes are slightly acidic, but worms still seem to like it and will tolerate it just fine in moderation. Whether you have an abundance of melon rinds, spoiled apples or fruit trimmings, you can feed them to your worms by slicing them up into manageable portions.

Can I feed my worms bread?

Fruit and vegie scraps, teabags and coffee grounds, crushed eggshells, small amounts of bread or pasta, moist cardboard and newspaper. you’re not overfeeding your worms. … This means you can feed your worm farm a few handfuls every few days.

How often should you water your worm farm?

Once every week, pour about five liters of fresh water into the Top Working Tray, which will flood down through the lower trays, ensuring the entire worm farm remains very moist. The sudden ‘flood’ will not harm the worms. Adding water is especially important in the hotter months of the year.

Why are my worms in the bottom tray?

The worms are heading to the bottom as they are trying to get cool. Add some bedding to the top layer (damp newspaper, cardboard) to encourage the worms upwards. Is the worm farm food too dry? Add a little moisture if it is.

How do I know if my worm bin is healthy?

Red wigglers like the temperature to be between 40-75 degrees. They will not live long on a sunny windowsill or out in the cold. Worms need moisture in their environment. The texture of their bedding should feel like a wrung-out sponge.

Can worms eat paper towels?

Worms will consume office paper, cardboard, newspaper, paper plates, paper towels and on it goes. Just throw them into your worm bin and they will eat it right up.

How often should I check my worm farm?

An indoor bin should be checked weekly and usually fed weekly (see above). If you keep your worm bin outdoors you can feed them a little more at each feeding and go a little longer between feedings. Plan to feed your outdoor composting worms about once every 2 or 3 weeks. Be careful not to overfeed your worms.

Can I put moldy food in my worm bin?

Yes, you can! The composting process requires composition, so when you add moldy foods, you’re just adding in foods that are already decomposing. Worm and compost bins can have both moldy foods and fresh foods added and you will end up with great compost either way!

Do worms eat dryer lint?

You can also feed your worms lint from your clothes dryer and paper towels (use only paper towels that were used to clean up drink spills and do not have cleaning solution on them).

Can worms eat potato peels?

Carrot peelings, potato skins, broccoli and cauliflower stalks, lettuce, kale, even onion peels (in limited quantities) are perfect for the worm bin. Vegetable waste like this isn’t prone to overheating your bin either, so this is another low-maintenance food.

Can worms eat egg shells?

eggshells – worms simply can’t eat them. … Eggshells are good for the garden, so if you crush them up, and put them in the worm farm, they’ll end up adding calcium to your soil. Eggshells don’t harm the worms, but can look a little unsightly in the gardenbeds.

Do worms like to eat cardboard?

Most importantly, the worms seem to thrive by brown cardboard and seem to love eating it! Don’t forget to shred, or cut up your brown cardboard to make it easier for the worms to digest and more suitable for bedding.

Do worms eat cardboard?

Although worms do think cardboard and paper are delicious, it is not, in fact, nutritious. A diet too heavy in cardboard and paper doesn’t add much nutritional value to your worms, and if they’re not eating properly, they won’t be able to compost efficiently (source).

Do worms like beer?

Obviously we need to remember that beer contains alcohol, which is not a worm-friendly substance. … But if the worms have a sizable safe zone in their habitat, a little alcohol is not going to cause any issues – and will likely evaporate or get converted into something else pretty quickly.