Douglas rattles around a collection of glass jars in the storage closet of his Denver apartment. They're filled with sterilized rye grains, covered in a soft white fungus — a mushroom spawn. Soon, he'll transplant it in large plastic bins filled with nutrients such as dried manure and coconut fiber.
Over the course of two weeks, a crop of mushrooms that naturally contain psilocybin, a psychoactive ingredient, will sprout. The species he grows include psilocybe cubensis.