The Worm Farmer's Handbook: Mid- To Large-Scale Vermicomposting for Farms, Businesses, Municipalities, Schools, and InstitutionsChoice Reviews, Outstanding Academic Title Techniques and systems for processing food scraps, manure, yard debris, paper, and more Turning waste into wealth sounds too good to be true, but many worm farmers are finding that vermicomposting is a reliable way to do just that. Vermicast a biologically active, nutrient rich mix of earthworm castings and decomposed organic matter sells for $400 or more per cubic yard. Compare that to regular compost, sold