| Priority 1A |
These weeds are not present in Montana. Management criteria will require eradication if detected; education; and prevention. -Yellow Starthistle (Centaurea solstitialis) |
| Priority 1B |
These weeds have limited presence in Montana. Management criteria will require eradication or containment and education. - Dyers Woad (Isatis tinctoria) - Eurasian Watermilfoil (Myriophyllum spicatum) - Scotch Broom (Cytisus scoparius) - Curlyleaf Pondweed (Potamagenton crispus) |
| Priority 2A |
These weeds are common in isolated areas of Montana. Management criteria will require eradication or containment where less abundant. Management shall be prioritized by local weed districts. - Tansy Ragwort (Senecio jucobea) |
| Priority 2B |
These weeds are abundant in Montana and widespread in many counties. Management criteria will require eradication or containment where less abundant. Management shall be prioritized by the local weed districts. - Canada Thistle (Cirsium arvense) - Common Tansy (Tanacetum vulgare) - Oxeye Daisy (Chrysanthemum leucanthemum) - Houndstongue (Cynoglossum officinale) - Yellow Toadflax (Linaria vulgaris) - Saltcedar (Tamarix spp.) |
| Priority 3 |
Regulated plants: NOT MONTANA LISTED NOXIOUS WEEDS) These regulated plants have the potential to have significant negative impacts. The plant may not be intentionally spread or sold other than as containment in agricultural products. The state recommends research, education, prevention to minimize the spread of the regulated plant. - Cheatgrass (Bromus tectorum)
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