I should add though that I have ‘added’ worms periodically from what is essentially a ‘grass manure pile.’ I have a compost pile (entirely open) that started from previous owner – it is mostly just grass clippings and excess garden waste and spoiled windfall apples. After a long enough time it just becomes what I am calling the grass manure pile – it smells exactly like cow manure and is completely colonized by redworms. I periodically dig up some of this and add to the regular compost bin, where it eventually converts into regular compost / worm droppings.

The extra air and bedding and worms get rid of the manure smell quickly.

For me this started as my parents used to keep worms, and when I wanted to dig up/reduce the green manure pile, I recognized them immediately.

I can’t say 100% that the worms came in on their own, they might well have been in/on some stuff that I added to the compost bin, but I don’t think so.

Anyway, I think many would be surprised how many redworms there are around in the average yard. They’ll show up anywhere outdoors there is anything ‘manure like’ (and rotting grass is essentially manure). Once they have a habitat they like, they’ll reproduce fairly quickly. It’s also why I’m confident that if they don’t survive the winter in the bin, there’ll be some I can add if needed.

This is, of course, different from trying to ensure maximum throughput in a worm farm. I’m in no rush.

GA,
How did you manage to have worms move in on their own?

Who knows, maybe my success before was from benign neglect – they do so well when we don’t mess with them.

My outdoor bin – with no special prep – has just plain frozen solid. I’ve been adding veggies and now a good ten inches of cardboard (in pieces), watered and now frozen. I’m not really worried about it – mostly curious to see what will happen when it gets warm and how quick it will bounce back and when the worms appear.

The second bin is also frozen – it now becomes the main one as the first is full. The layer of leaves at the bottom is frozen and it now has its own top layers – fifteen inches or so – of (wetted, now frozen) cardboard chunks. This one probably didn’t have worms established before the winter hit, so will need an injection once they turn up. Food waste, when added, freezes pretty quick – no need to use a freezer, anyway.

I’m now thinking I’ll need an indoor bin just to help out and ensure the presence of a healthy, hungry herd for spring!