These earthworms are usually smaller than those of the same species raised in vermiculture systems, and their reproductive rates are frequently lower. The focus of this practice is on processing the waste rather than creating ideal conditions for raising earthworms. Vermicomposting is the process of earthworms turning organic debris into worm castings, the fertile waste product of earthworms.

Worm growers make money from sales of earthworms and sometimes, but not always, by selling castings. Worm farmers usually purchase and haul feedstock or pay for feedstock to be delivered to them. Vermiculture is the raising of earthworms for resale or use in vermicomposting systems, so the focus of this practice is on ideal conditions for worm growth, reproduction, and health. They may also profit from tipping fees-charging to have organic materials normally disposed of in landfills 'tipped' by a dump truck onto the worm grower’s site, to be fed to the earthworms. Earthworm growers can earn income by selling earthworms or vermicompost.

Download nightcrawler castings