We may receive a commission on purchases made from links. It may be hard to wrap your head around the garden value of worm castings — the waste produced by lowly earthworms. They're collected from ...

ROYAL CITY, Wash. — Royal Dairy is home to the world’s largest worm farm, but that’s just one part of a much bigger sustainability story. Royal Family Farming, in Royal City, Wash., and CMI Orchards, ...