A "Noxious Weed", by definition of the Montana County Noxious Weed Act (PDF), means any exotic plant species established or that may be introduced into the state that may render land unfit for agriculture, forestry, livestock, wildlife, or other beneficial uses or that may harm native plant communities and that is designated as a statewide noxious weed by the rule of the department; or as a district noxious weed by a board, following public notice of intent and public hearing (MCA 7-22-2101).