Feral cannabis

Feral cannabis or wild marijuana, often referred to in the United States as ditch weed, is wild-growing cannabis generally descended from industrial hemp plants previously cultivated for fiber, with low or negligible amounts of psychoactive THC. The Drug Enforcement Administration defines ditch weed as "wild, scattered marijuana plants [with] no evidence of planting, fertilizing, or tending." Industrial hemp was widely cultivated in the American Midwest in the mid-20th century, particularly to support the war effort during World War II, and since that period the plant has re-seeded naturally and grown wild in states such as Oklahoma, Missouri, Nebraska, and Minnesota, with Indiana reporting the largest concentrations nationally.