Worm poop! (Also known as castings, black gold, or worm gold.) Sabine Heinlein/NYT Wirecutter. After a couple of months, I harvested the castings to use them in one of two control groups in the ...

Garden centers sell this odorless worm poop — called vermicompost, vermicast or worm castings — at a premium, but you can cultivate a steady supply in a small tub by raising the worms yourself.

PLANTERSVILLE, Texas -- At Magic Worm Ranch, 128,000 night crawlers are eating away at soil and grains. The ranch has a process that collects their castings, also known as worm poop. "As the soils ...