My worm population in my bin has dwindled. It was anaerobic, sloppy crap at the bottom of the bin (yes, I know what went wrong). I decided that my best rescue effort may be to dump the whole mess onto one of my cooled compost piles and see if the remaining worms would act as a seed population.

However- my garden was lasagna style, and I add copious half finished compost every spring. This year it is several inches deep in worm castings! This didn't become obvious until after I ordered my worms.

I mean it's incredible! Took a few years for them to colonize the garden because it was built on a base of compacted fill (sand/gravel) so that there wasn't really soil nearby. This spring as I broke down the compost pile that I had built on the garden bed for the winter- there were lots of worms at the bottom- mostly redworms, but now there are also lots of giant nightcrawlers.

So- an outdoor bin it is. It's pretty easy as long as I'm not trying :)