What is a Noxious Weed?
Noxious weeds are defined as being any exotic plant species which may render land unfit for agriculture, forestry, livestock, wildlife or other beneficial uses or that may harm native plant communities.
Click here for plant definitions.
Click here to find out what weeds are in your area
Priority 1 Weeds:
These noxious weeds are currently not found in Missoula County. Management criteria include monitoring for their presence, prevention, education, mapping, and if found, eradication.
|Curly Leaf Pondweed||Eurasian Watermilfoil||Flowering Rush||Rush Skeleton Weed|
|Scotch Broom||Tansy Ragwort||Yellow Starthistle|
Priority 2 Weeds:
These noxious weeds are small infestations, less than 1000 acres, and classified as "new invaders." These plants have the highest priority in Missoula County to keep them from spreading. Management criteria include prevention, education, early detection, mapping, and eradication. Landowner groups will be organized for each new invader weed species. Priority for controlling Knotweed complex and Tamarisk will be in the riparian areas. Control of these two plants grown as ornamentals will be voluntary by the homeowner. The Weed District will pay up to $100.00 towards their removal.
|Blueweed||Diffuse Knapweed||Dyer's Woad||Knotweed Complex|
|Meadow Hawkweed||Orange Hawkweed||Perennial Pepperweed||Purple Loosestrife|
|Russian Knapweed||Tamarisk or Saltcedar||
Priority 3 Weeds:
These noxious weeds are widespread infestations over 1000 acres. They are managed through organized cooperative landowner groups. Scattered infestations of Leafy spurge, Dalmatian toadflax, and Yellow toadflax outside the designated infestations will be
|Canada Thistle||Common Tansy||Dalmation Toadflax||
|Hoary Alyssum||Houndstongue||Leafy Spurge||Oxeye Daisy|
|St. Johnswort||Spotted Knapweed||Sulfur Cinquefoil||Tall Buttercup|
The Montana Department of Agriculture has designated the following plants as "regulated" which means they cannot be sold or distributed.