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Fergus County Weed District - Noxious Weeds

Select this link to print the State Designated Noxious Weed Categories in PDF

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)
  • Flowering Rush (Butomus umbellatus)
  • Japanese Knotweed Complex (Polygonum spp.)
  • Purple Loosestrife (Lythrum spp.)
  • Rush Skeletonweed (Chondrilla juncea)
  • 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)
  • Meadow Hawkweed (Hieracium spp.)
  • Orange Hawkweed (Hieracium aurantiacum)
  • Tall Buttercup (Ranunculus acris)
  • Perennial Pepperweed (Lepidium latifolium)
  • Yellowflag Iris ( Iris pseudacorus)
  • Blueweed (Echium vulgare)
  • Hoary Alyssum (Berteroa incana)

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)
  • Field Bindweed (Convolvulus arvensis)
  • Leafy Spurge (Euphorbia esula)
  • Whitetop (Cardiaria draba)
  • Russian Knapweed (Centaurea repens)
  • Spotted Kanpweed (Centaurea stoebe or maculosa)
  • Diffuse Knapweed (Centaurea diffusa)
  • Dalmation toadflax (Linaria dalmatica)
  • St. John'swort (Hypericum perforatum)
  • Sulfur Cinquefoil (Potentilla recta)
  • 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)
  • Hydrilla (Hydrilla verticillata)