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I live in an condo with a fascist condo owners' association, so I can't keep a real worm farm. But at my parents' house, I have a compost pile of leaves and grass clippings. If it's not too dry out, I can always collect earthworms from that pile.
I used to have the compost piled up so high that the compost would generate enough heat to produce worms through the winter, even if there was snow on top. The neighbors complained about the unsightly mountain of grass and leaves and I had to flatten it out.
Technology never produced anything more effective than the lowly earthworm as a panfish bait.
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