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Montana Noxious Weed List
Priority 1A: These weeds are not present in Montana. Management criteria will require eradication if detedted; 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.
- Dyer's woad (Isatis tinctoria)
- Flowering rush (Butomus umbellatus)
- Japanese knotweed complex (Polygonum spp.)
- Purple loosestrife (Lythrum spp.)
- Rush skeletonwed (Chondrilla juncea)
- Eurasian watermilfoil (Myriophyllum spicatum)
- Scotch broom ( Cytisus scoparius)
- Curlyleaf pondweed (Potamogeton crispus)
Priority 2A: These weeds are common in isolated areas in Montana. Management criteria will require eradication or containment where less abundant. Management shall be prioritized by local weed districts.
- Tansy ragwort (Senecio jacobaea)
- Hoary Alyssum (Berteroa incana)
- Meadow hawkweed complex (Hieracium spp.)
- Orange hawkweed (Hieracium aurantiacum)
- Tall buttercup (Ranunculus acris)
- Perennial pepperweed (Lepidium latifolium)
- Yellowflag iris (Iris pseudacorus)
- Blueweed (Echium vulgare)
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 local weed districts.
- Canada thistle (Cirsium arvense)
- Field bindweed (Convolvulus arvensis)
- Common tansy (Tanacetum vulgare)
- Saltcedar (Tamarix spp.)
- Houndstongue (Cynoglossum officinale)
- Leafy Spurge (Euphorbia esula)
- Oxeye Daisy (Leucanthemum vulgare)
- Russian Knapweed (Acroptilon repens)
- Spotted Knapweed (Centaurea stoebe)
- St. Johnswort (Hypericum perforatum)
- Sulfur Cinquefoil (Potentilla recta)
- Whitetop or Hoary Cress (Cardaria draba)
- Yellow Toadflax (Linaria vulgaris)
Priority 3: Regulated Plants: (NOT MONTANA LISTED NOXIOUS WEEDS)Thses regulated plants have the potential to have significant negative impacts. The plants may not be intentionally spread or sold other that as a contaminant in agricultural products. The state recommends research, education and prevention to minimize the spread of the regulated plant.
- Cheatgrass (Bromus tectorum)
- Hydrilla (Hydrilla verticillata)
- Russian olive (Elaeagnus angustifolia)