Feeding Your Worms

Your worms are livestock. Livestock with no legs, no eyes, and surprisingly strong opinions about citrus. Feed them well and they pay rent in black gold. Feed them badly and they file complaints in the form of smells, fruit flies, and dramatic escape attempts.

What worms actually eat (it’s not what you think)

Here’s the first nerdy truth: worms don’t really eat your banana peel. They eat the microbes decomposing your banana peel. Worms are connoisseurs of rot — the bacteria and fungi do the cooking, the worms show up for the buffet. This is why soft, aging scraps disappear faster than fresh ones, and why a worm bin is really a microbe farm with worm management.

That gives you the two food groups that matter:

• Greens (nitrogen-rich): fruit and veggie scraps, coffee grounds, tea bags, fresh yard trimmings.
• Browns / bedding (carbon-rich): shredded cardboard, newspaper, coconut coir, dry leaves. This is also their house, so it does double duty.

Aim for roughly 2–3 parts browns to 1 part greens by volume. Too many greens and the bin goes slimy and stinky (nitrogen overload, anaerobic conditions — the microbes switch to the smelly kind of respiration). When in doubt, add more bedding. Bedding fixes almost everything. Bedding is the duct tape of worm farming.

The menu: yes, please

• Fruit and veggie scraps — the classics. Chop them small; smaller pieces = more surface area = faster microbe colonization = dinner served sooner.
• Coffee grounds and filters — worms love them, and the gritty texture aids their gizzards. Yes, worms have gizzards. Yes, that’s delightful.
• Tea bags — remove the staple first, unless you want to harvest hardware with your castings.
• Crushed eggshells — the secret weapon. Eggshells provide grit for digestion and calcium carbonate that buffers pH. A bin without eggshells slowly drifts acidic, and acidic bins make grumpy worms. A tablespoon of powdered shells per feeding is plenty.
• Bread, grains, and pasta — in small amounts. They mold fast, which worms love, but overdo it and you’ll get a mite rave.
• Pumpkin and squash — worm crack. Cut a pumpkin open in a bin and come back in a week; it’ll look like a tiny music festival in there.

The menu: absolutely not

• Meat, dairy, fats, and oils — they rot anaerobically, stink, and attract every raccoon in the county. Your worms are vegetarians. Respect their lifestyle.
• Citrus in bulk — a little orange peel is fine, but a bag of lemons will spike acidity and the worms will hold a protest. Compost citrus separately or add it sparingly with extra eggshells.
• Onions and garlic in bulk — same deal. A little is fine; a lot is a chemical weapon.
• Pet waste — pathogens. Never. This isn’t negotiable.
• Glossy or colored paper — inks and coatings you don’t want in castings you’ll put on food crops.
• Spicy peppers — funny exactly once, then the bin smells like regret.

How much and how often

The golden rule: feed only when the last meal is mostly gone. New bins start slow — a cup or two of scraps a week. A mature, thriving bin of African nightcrawlers can process a genuinely surprising amount, so scale up gradually and let the worms set the pace.

Practical tips that actually matter:

• Bury the food under a few inches of bedding. Exposed food is a fruit-fly nursery and a smell factory. Buried food is a worm restaurant with a dress code.
• Feed in rotation — different corners of the bin each time, so you can see what’s been eaten and what hasn’t.
• Chop or freeze scraps first. Freezing ruptures cell walls (the microbes thank you), and thawed scraps break down dramatically faster. Your freezer’s “worm bag” is a power move.

Troubleshooting the restaurant

• It smells bad — overfeeding, too wet, or not enough airflow. Stop feeding for a week, add a big handful of dry shredded cardboard, and fluff the bedding with a fork. Smell is the bin’s check-engine light.
• Fruit flies — bury food deeper, keep a thick dry bedding cap on top, and set a vinegar trap nearby. The flies are annoying; they’re not an emergency.
• Worms trying to escape — this is the serious one. Mass exodus means the bedding is too acidic, too wet, too hot, or freshly toxic (like too much fresh food fermenting). Check moisture (it should feel like a wrung-out sponge), add crushed eggshells, add dry bedding, and make sure the bin isn’t cooking in the sun.
• Mites — tiny white or brown dots swarming the food. Usually harmless and self-limiting; cut back on feeding and let the bin dry slightly.

The Florida factor

Heat is a catalyst. In a Florida summer, everything in the bin happens faster — food breaks down quicker, microbes party harder, and moisture evaporates while you watch. Feed smaller amounts more often in summer, keep bins in full shade (a garage, carport, or laundry room beats “the sunny corner of the patio” every time), and check moisture twice as often as you think you need to. African nightcrawlers tolerate heat better than most composting worms, but “tolerates Florida” and “enjoys a bin baking at 95°F” are different things. Shade is love. Shade is life.

Keep growing: New to bins entirely? Start with How to make a worm bin and Florida worm-bin setup. When the bin is full of black gold, read Harvesting worm castings. And if you’d rather skip straight to the good stuff, the shop has castings ready to go.

Keep Growing 🌱

Where to go next:

• How to make a worm bin
• Florida worm-bin setup
• Worm Bin Troubleshooter: What’s Wrong With Your Bin?