As new food scraps are added, the worms migrate toward the top to feed, leaving their castings below. Then, you'll release the bottom and harvest the bounty. This system is called a continuous flow ...

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Worms can live for up to 10 years. Worms eat their own weight in organic waste, soil and minerals and excrete their own weight in castings daily, which makes compost and enriches the soil.

Maryam Nouri-Aiin, a UVM postdoctoral plant and soil science researcher, points out the kind of worms you don’t want to see in your garden. “They usually turn a really big area into castings ...