Red Worms and Vermicomposting Guide for Beginners

So you want to keep a box of worms in your house. I get it. It sounds weird. But Chapter 4 of Kim Pezza’s Backyard Farming: Composting makes a pretty convincing case that vermicomposting might be the best way to compost, period. Especially if you live in an apartment and your landlord would lose it if you started a compost pile on the balcony.

What Vermicomposting Actually Is

Regular composting uses heat from microbial activity to break stuff down. Vermicomposting uses worms and microorganisms instead. The key difference: regular compost wants to be hot and relatively dry. Worm bins want to be cool and moist. Basically the opposite.

The worms you need are called Eisenia fetida. You might see them listed as red worms, red wigglers, tiger worms, red California earth worms, or trout worms. They go by a lot of names. But here’s the important part: do NOT just go dig up night crawlers from your yard. They’re a different species entirely, and they won’t do the job.

What comes out the other end (literally) is called worm castings. Which is a polite way of saying worm poop. The entire system produces castings, mucus secretions from the worms, and broken-down organic material. All of it is incredibly good for plants. We’re talking natural growth hormones and enzymes that you just can’t get from regular compost.

I’ll be honest, “worm poop makes your plants grow better” is one of those facts that sounds made up but is completely real. Nature is strange.

You can also keep adding new food scraps continuously, unlike a regular compost pile where you might need to stop adding and let it finish. That ongoing cycle is a real advantage.

The Downsides

Worms are living things, and they need care. You have to keep them moist, keep them at the right temperature, and sometimes remove them by hand when you’re harvesting castings. They’re low-maintenance pets, but they’re still pets.

Cold weather is also a problem. If you keep your bin outdoors and it gets too cold, the worms slow down or stop working entirely. More on how to handle that in a minute.

Picking a Bin

There are more options than you’d think.

Traditional bins are the simplest. A plastic storage container or bucket (at least 2 gallons) with some holes drilled in it. Nothing fancy. Works fine.

Flow-through bins are a wooden box or barrel where you add food to the top and harvest finished castings from the bottom. The worms stay up top where the fresh food is, so you don’t have to sort through them to get your compost.

Stacked bins are great if you’re tight on space. Multiple bins sit inside each other, and the bottom bin catches liquid runoff. That liquid is called “worm tea,” and it’s basically liquid fertilizer.

Trays are shallow containers mainly used for worm reproduction. Unless you’re planning to start a worm business, you probably don’t need these.

Outdoor bins can be buried in the ground or sit above ground. If you go the outdoor route and live somewhere with cold winters, you’ll need to think about insulation. Pezza suggests building a box around the bin and filling the gap with insulation, putting old windows on top to trap heat, or even placing the bin near a dryer vent for mild winters. There are also special heaters made for worm bins if you want to go that route.

Getting Your Worms

You can buy red worms from worm farms, order them online, or find them advertised in garden magazines. Some commercially made vermicomposting systems come with coupons for worms, which is a nice touch.

Here’s a fun biology fact: all red worms are hermaphrodites. They have both male and female parts. But they still need a partner to reproduce. So don’t think you can start with one worm and build an empire. Buy at least a pound to start.

Setting Up Your Bin

This is where it gets hands-on.

Bedding goes in first. Shredded newspaper works great, but stick to black and white print only. Cardboard and peat are also good options. Tear it into strips, get it damp (think “wrung-out sponge”), and fill the bin about three-quarters full.

One thing to watch: don’t use chlorinated tap water. Chlorine is bad for the worms. If tap water is all you’ve got, fill a container and let it sit for 24 hours. The chlorine will dissipate on its own.

Toss in up to 4 cups of clean soil. This gives the worms grit to help with digestion, similar to how chickens use small stones.

Then add about a pound of worms and let them settle in.

Feeding is simple: give them about half their body weight in food per day. So a pound of worms gets about half a pound of food. No meat, bones, dairy, or oil. Go easy on citrus too. Basically, fruit and vegetable scraps are your go-to.

Temperature should stay between 55 and 75 degrees Fahrenheit. Keep the bin away from vibrations. Worms are sensitive to that.

And here’s the coolest fact in this whole chapter: worms breathe through their skin. They don’t have lungs. If their skin dries out, they literally suffocate. That’s why keeping the bedding moist is so important. It’s not just about comfort. It’s life or death for them.

Fluff the bedding once a week to keep air flowing through it. Compacted bedding means less oxygen, and your worms need that oxygen coming through their skin to stay alive.

Is It Worth It?

A lot of composters consider vermicomposting the best method available. The castings are richer than regular compost, the system works in small spaces, and once you get it going, it’s pretty self-sustaining. You’re basically running a tiny recycling factory powered by worms that turn your food scraps into plant food.

The setup takes maybe an hour. The daily maintenance takes a few minutes. And your plants will thank you.

Just maybe don’t tell your guests about the box of worms under the sink until after dinner.

This post is part of a series retelling Kim Pezza’s Backyard Farming: Composting with my own commentary and reactions.

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