Montana Noxious Weeds List
Effective April 15, 2008
Use dropdown boxes below to see pictures and descriptions of weeds in the
three categories.
NOTE: Descriptions and photos of newer additions to lists may be lacking.
See current list.
| Category 1 noxious weeds are currently established and generally widespread in the state. Management criteria include awareness and education, containment, suppression of existing infestations and prevention of new infestations. These weeds are capable of rapid spread and render land unfit or greatly limit beneficial uses. |
Category 2 noxious weeds have recently been introduced to the state or are rapidly spreading from their current infestation sites. These weeds are capable of rapid spread, rendering lands unfit for beneficial uses. Management criteria include awareness and education, monitoring and containment of known infestations, and eradication where possible. |
Category 3 noxious weeds have not been detected in the state or may be found only in small, scattered, localized infestations. Management criteria include awareness and education, early detection and immediate action to eradicate infestations. These weeds are known pests in nearby states and are capable of rapid spread and render land unfit for beneficial uses. |
Category 4 weeds are introduced species that may threaten state resources if they become widespread, and are added to the list while studies determine the risk of spread and potential damage. The first species placed on this list in 2008 is Scotch broom (Cytisus scoparius).
