California’s Humboldt County is the first county in the state to permanently ban outdoor hemp growing. Many California counties prohibit or have moratoria on hemp farming due to fears about cross-pollination with marijuana plantations. The county board of supervisors recently passed an ordinance instituting the ban. The ordinance may be amended to allow research projects, and the ban only applies to unincorporated areas of the county; some cities can make their own rules regarding industrial hemp. Humboldt County instituted a temporary moratorium on outdoor hemp growing in 2018.