How to find composting worms for free to start your worm composter

Buying your first composting worms from a specialist supplier is still the most reliable way to get started, as we explain in our guide Which type of worms should you use in your worm composter? But it isn't your only option. In good conditions, a worm population doubles every two to three months, so many home worm composter owners end up with far more worms than they need. Here's where and how to get some of that surplus for free.

Ask around

This is the simplest and often the quickest route: family, friends, neighbors, coworkers. Vermicomposting is catching on fast, and there's a good chance someone in your wider circle already has a well-established worm bin. A mature colony handles having some of its worms taken very well. Giving away a shovelful of worm-rich compost puts the original worm composter in no danger at all, because the population quickly bounces back.

This is actually a trait specific to composting worms: their population naturally regulates itself based on the space and food available. The more crowded a bin gets, the more the breeding rate automatically slows down, until it levels off. Taking some of the worms simply frees up space and food for the ones left behind, which then return to their usual breeding rate — a gift of worms benefits the recipient just as much as the original colony.

Don't hesitate to post a request in neighborhood groups or on local social networks, too (local Facebook groups, neighborhood giveaway apps, local gardening forums). Worm composter owners looking to give away surplus worms are far more common there than you might think.

Willy's tip

A healthy worm composter naturally produces more worms than it needs. Asking someone who already practices vermicomposting for a few costs them nothing, and it saves you the price of your first worms.

Turn to local organizations and community gardens

Community composting groups, community gardens, and some environmental education organizations often run composting sites that naturally host populations of composting worms. Many are happy to give away a small amount to help a new household get started, especially if you get a little involved in the life of the site (occasional volunteering, membership). A quick search for the composting group or community garden closest to you is often the best place to start.

Take advantage of a local government program

As part of their waste reduction programs, many local governments hand out worm composters already stocked with worms at public meetings, zero-waste events, or through school programs. If your city or county runs this kind of program, it's often a chance to go home with a complete worm composter, worms included, without spending a dime. Check with your city's environmental or waste management department to find out whether a program like this is planned near you.

What to check before accepting a free batch

A gift of worms is always useful, as long as you check a few things before settling them in:

• Quantity: to get off to a good start, ideally plan on at least 9 oz to 1.1 lb (250–500 g) of worms. A batch that's too small will take longer to settle in and to process your first food scraps.
• Overall condition: active worms that quickly recoil from light and have nicely moist skin are a good sign. We go over the signs of a healthy worm in detail in our guide Which type of worms should you use in your worm composter?
• Origin of the batch: always choose worms from an existing worm composter (established compost) rather than worms picked up at random in a yard, which may not be a suitable species.
• A short adjustment period: a batch of unknown origin may take a few days to adjust to its new environment. Don't worry if activity seems a little slow at first.

Willy's tip

The best gift of worms always comes from a worm composter that's already up and running: you get not only suitable worms but also a small community of microorganisms already well adapted to the process.

What if you can't find anyone?

If none of these options works out, check out our selection of Eisenia composting worms to start with a batch whose species and quantity are guaranteed. Once you have your worms, see our guide How to start your worm composter for the next steps.

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