In the United States it is legal to purchase poppy seeds, but all other parts of the plant are considered a schedule II controlled substance under the federal Controlled Substance Act of 1970. The Opium Poppy Exclusion Act of 1942 bans growing of the poppy in many cases but is generally not a problem for gardeners as the plant is widely grown for the flowers and for seeds for replanting and cooking, and for much of US history poppies were a significant cash crop, with the government especially pushing for farmers to grow more poppies for medicinal use during wars up to World War I.[5]