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Montana Noxious Weed Information

Below is the Montana Noxious weed list, updated December 2013. Some counties have additional weeds on their county noxious weed list.
Priority 
1A
Not present or very limited presence in Montana.  Management criteria will require prevention, education, and eradication if detected.
Priority 
1B
Limited presence in Montana.  Management criteria will require eradication or containment, where present, and prevention and education elsewhere.
Priority 
2A
Common in isolated areas of Montana.  Management criteria will require containment and suppression where common; and eradication, prevention, and education where less abundant.  Management shall be prioritized by local weed districts.
Priority 
2B
Abundant in Montana and widespread in many counties.  Management criteria will require containment and suppression where abundant and widespread; and eradication, prevention and education where less abundant.  Management shall be prioritized by local weed districts.
Priority 
3
NOT noxious weeds, but regulated plants that have the potential to have significant negative economic and ecological impacts.  Intentional spread or sale of regulated plants other than as a contaminant in agricultural products is prohibited.  Research, education, prevention, and control programs, where appropriate, are recommended to minimize the spread of these weeds.  Control of Priority 3 weeds is not mandated.

Priority 1A
Yellow starthistle
Dyer's woad

Priority 1B
Knotweed complex (Fallopia spp.)
Purple loosestrife (Lythrum spp.)
Rush skeletonweed (Chondrilla juncea)
Scotch broom (Cytisus scoparius)

Priority 2A
Blueweed (Echium vulgare)
Hoary alyssum (Berteroa incana)
Meadow hawkweed complex (Hieracium spp.)
Orange hawkweed (Hieracium aurantiacum)
Perennial pepperweed (Lepidium latifolium)
Tall buttercup (Ranunculus acris)
Tansy ragwort (Senecio jacobaea)
Yellowflag iris (Iris pseudacorus)

Priority 2B
Canada thistle (Cirsium arvense)

Common tansy (Tanacetum vulgare)
Curlyleaf pondweed (Potamogeton crispus)
Dalmatian toadflax (Linaria dalmatica)
Diffuse knapweed (Centaurea diffusa)
Eurasian watermilfoil (Myriophyllum spicatum)
Field bindweed (Convolvulus arvensis)
Flowering rush (Butomus umbelatus)
Houndstongue (Cynoglossum officinale)
Leafy spurge (Euphorbia esula)
Oxeye daisy (Chrysanthemum leucanthemum)
Russian kapweed (Centaurea repens)
Saltcedar (Tamarix spp.)
Spotted knapweed (Centaurea stoebe or maculosa)
St. Johnswort (Hypericum perforatum)
Sulfur cinquefoil (Potentilla recta)
Whitetop (Cardaria draba)
Yellow toadflax (Linaria vulgaris)

Priority 3
Cheatgrass (Bromus tectorum)
Hydrilla (Hydrilla verticillata)
Russian olive (Elaeagnus angustifolia)

View Text-only Version Text-only Updated: 8/12/14
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OTHER WEBSITES OF INTEREST:

Montana Noxious
Weed Program

MSU Weed and Invasive Plant Ecology and Management

Montana Weed
Control Association

Statewide Noxious
Weed Awareness and
Education Campaign

Center for Invasive Plant Management

Montana Dept. of
Agriculture

Find Your Local
Weed Coordinator

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