What to feed worms is the first question every beginner asks: feed worms fruit and vegetable scraps, coffee grounds, crushed eggshells, and plain bread. Never feed meat, dairy, oil, or pet waste. Feed half a cup at a time, bury it under the bedding, and cover it with three parts bedding to one part food. Do not feed again until the last feeding is mostly gone.
That is the whole rule. The rest of this guide is the detail: which scraps worms love, which ones to go easy on, and which ones will wreck your bin.
Quick picks: Best foods are banana peels, apple cores, lettuce, carrot peelings, coffee grounds, and crushed eggshells. Feed in small amounts, chopped small. Never feed meat, dairy, oil, citrus in bulk, onions in bulk, or pet waste. If it smells, stop feeding and add bedding.
The Ranking Criteria First
This guide ranks foods by four things, in this order: whether worms can eat it safely, whether it smells, whether it upsets the bin’s moisture and acidity, and whether it attracts pests. A food that fails the first test is out, however common it is in your kitchen.
What to Feed Worms: Best Foods to Feed Freely
Fruit and vegetable scraps are the staple. Banana peels, apple cores, melon rinds, lettuce, cabbage leaves, carrot and potato peelings, cucumber ends, and squash scraps are all excellent. Chop them small — pieces the size of a thumbnail break down in days, while a whole potato takes weeks.
Coffee grounds are a worm favourite, and so are their paper filters. Tea bags work too, if you remove any staple and tear the bag open. Crushed eggshells add grit, which helps worms grind their food, and they also balance acidity. Plain bread, pasta, and cooked rice are fine in small amounts, but they go mouldy fast, so feed less of them than you would vegetables.
Good Foods: Feed in Small Amounts
Citrus fruit and onions are safe in small amounts, but too much will make the bin acidic. A few orange segments a week are fine. A whole bag of oranges is not. The same goes for pineapple, tomatoes, and other acidic foods — a little is fine, a lot is a problem.
Spicy food, salty food, and vinegar dressings belong in this group too. A spoonful of leftovers is harmless. A whole plate of salty takeaway is not. When in doubt, feed less, and watch the bin for two days before you feed that food again.
Watch out: bread, pasta, and rice go mouldy in a day or two. Feed a small handful only, and bury it deep under the bedding.
Never Feed These
Meat, fish, dairy, oil, butter, and pet waste never go in a worm bin. They smell as they rot, they attract flies and rats, and they can carry germs that do not belong in a home. Cooked meat is no better than raw meat — the fat and protein are the problem, not the cooking.
Also never feed glossy paper, coloured inks, plastic, metal, glass, or anything treated with chemicals. Shredded newspaper and plain cardboard are bedding, not food, and they belong in the bedding layer. Cat litter, dog waste, and human waste never go in a bin, full stop.
| Food | Verdict | Notes |
|---|---|---|
| Banana peels, apple cores | Feed freely | Chop small |
| Lettuce, carrot peelings | Feed freely | Staple food |
| Coffee grounds, tea | Feed freely | Filters included |
| Crushed eggshells | Feed freely | Adds grit, balances acid |
| Bread, pasta, rice | Small amounts | Goes mouldy fast |
| Citrus, onions | Small amounts | Too much makes acid |
| Meat, dairy, oil | Never | Smells, attracts pests |
| Pet waste | Never | Germs, never in a home bin |
How Much to Feed
A new bin eats about half what a settled bin eats. Start with half a cup of scraps, once or twice a week. When that feeding disappears in 2 to 3 days, feed a little more. When food sits for a week, feed less.
Use the rule in the Worm Bin Calculator: 1 lb of red wigglers eats about 0.5 lb of scraps a day. A bin with 1 lb of worms can handle about half a pound of scraps a day, once it is settled. A new bin cannot. Give it two weeks to catch up.
Weigh your scraps for one week if you are unsure. Most households are surprised — they produce far less worm-safe food than they think, once meat, dairy, and oil are taken out. The worked maths is in How Many Worms Do I Need?.
How to Feed: Bury It Every Time
Dig a small hole in the bedding, put the food in, and cover it completely with bedding. Then add dry bedding on top — about three parts bedding to one part food, by volume. The Bedding Ratio Helper works this out: 2 cups of food needs about 6 cups of bedding.
Feed in a different spot each time. Move around the bin in a circle, so the worms work through the whole bin over a few weeks. Feeding in the same spot every time creates a wet, sour patch that the worms avoid.
Watch out: food left on the surface is an open invitation to fruit flies. If you can see food, it is not buried deep enough.
What If the Bin Smells?
A healthy bin smells like damp earth. If yours smells sour, sweet, or like rotten eggs, stop feeding for a few days and add dry shredded newspaper. The smell is almost always overfeeding, too little bedding, or food that is too wet.
Check the moisture too. Squeeze a handful of bedding. If water drips out, it is too wet — add dry bedding and leave the lid ajar for a day. If the bedding feels dry and crumbly, sprinkle a little water on it. It should feel like a wrung-out sponge.
Freezing Scraps First
Many keepers freeze scraps in a bag, then thaw them before feeding. Freezing breaks down the cell walls, so the worms eat the food faster, and it kills fruit fly eggs that came in on the peel. It also lets you save scraps through the week and feed once, instead of feeding a little every day.
Thaw the scraps fully before you feed them, and drain off any extra liquid. Frozen scraps straight from the freezer will chill the bin, and the melt water will make the bedding too wet.
What to Feed Worms: What the Experts Say
When you are deciding what to feed worms, start with the same safe staples the experts recommend: chopped fruit and vegetable scraps, coffee grounds, and crushed eggshells. Oregon State Extension’s vermicomposting guide lists those foods among the best choices for a home worm bin, and it warns against the same never-feed items used here, including meat, dairy, and pet waste. Knowing what to feed worms is mostly a matter of sticking to that safe list and burying each feeding under dry bedding.
The US EPA’s home composting guidance also recommends keeping food scraps out of landfill by composting them, and a worm bin is simply the indoor version of that habit. If you are still unsure what to feed worms on a busy week, fall back on the safe staples above, chopped small and buried deep, and skip anything you would not want rotting in your kitchen. The EPA’s composting at home page is a useful check before you add something new.
What to feed worms if I only have a few scraps?
A small handful of chopped fruit and vegetable scraps is plenty for a new bin. That is the safest answer to what to feed worms when your bin is new: feed a little, bury it under bedding, and wait until the last feeding is mostly gone before you add more.
FAQ
What is the best food for worms?
Fruit and vegetable scraps — banana peels, apple cores, lettuce, and carrot peelings — plus coffee grounds and crushed eggshells. Chop scraps small and bury them under the bedding.
Can worms eat banana peels?
Yes. Banana peels are one of the best worm foods. Chop them small and bury them. They break down fast and the worms love them.
Can worms eat bread?
Yes, in small amounts. Bread goes mouldy fast, so feed a small handful only, buried deep under the bedding. Do not feed a whole loaf at once.
What should you never feed worms?
Meat, dairy, oil, butter, and pet waste. They smell, attract pests, and can carry germs. Also never feed glossy paper, plastic, or anything treated with chemicals.
Author Box
Written by Ritika, a home gardener who keeps a worm bin under the sink and learned vermicomposting one mistake at a time. Read more on the About the Author page.
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