Dreamgrass is an herbal sedative and mild hallucinogenic agent that is popularly used as a pain medication among folk-healers. It is also a recreational drug, which is apparently legal within the Empire. In Five Hundred Years After, Greycat suggested to the Jhereg legally banning the substance so as to create artificial scarcity and higher prices, thus creating greater profits for the Organization, but this never actually happened. Dreamgrass is administered by inhaling the fumes of the burning plant. See also Meta:Dreamgrass.