Category One Weeds: (State declared noxious weeds)
Currently widespread and well established in Montana.
Canada Thistle |
(Cirsium Arvense) |
Field Bindweed |
(Convolvulus arvensis) |
Whitetop or Hoary Cress |
(Cardaria draba) |
Leafy Spurge |
(Euphorbia esula) |
Russian Knapweed |
(Centaurea repens) |
Spotted Knapweed |
(Centaurea maculosa) |
Diffuse Knapweed |
(Centaurea diffusa) |
St. Johnswort (Goatweed) |
(Hypercum perforatum) |
Sulfur (erect) cinquefoil |
(Potentilla recta) |
Common Tansy |
(Tanacetum vulgare) |
Oxeye Daisy |
(Chrysanthemum leucanthemum L.) |
Houndstongue |
(Cynoglossum officinale L.) |
Dalmation toadflax |
(Linaria dalmatica) |
Yellow Toadflax |
(Linaria vulgaris) |
Hoary alyssum |
(Berteroa incana) |
Category Two Weeds: (State declared noxious weeds)
Weeds introduced recently and rapidly expanding.
Rush Skeltonweed |
(Chondrilla juncea) |
Tansy Ragwort |
(Senecio jacobaea L.) |
Meadow Hawkweed Complex |
(Hieracium pratense, H. floribundum, H. piloselloides) |
Orange Hawkweed |
(Hieracium aurantiacum L.) |
Tall Buttercup |
(Ranunculus acris L.) |
Tamarisk (Saltcedar) |
(Tamarix spp.) |
Perennial Pepperweed |
(Lepidium latiolium) |
Yellow flag iris |
(Iris pseudacorus) |
Blueweed |
(Echium vulgare) |
Purple loosestrife |
(Lythrum salicaria) |
Category Three Weeds: (State declared noxious weeds)
Weeds not yet detected except in isolated instances, but posing a threat to Montana.
Yellow Starthistle |
(Centaurea solstitialis) |
Common Crupina |
(Crupina vulgaris) |
Dyers Woad |
(Isatis tinctoria) |
Eurasian Watermilfoil |
(Myriophyllum spicatum) |
Flowering rush |
(Butomus umbellatus) |
Japanese knotweed |
(*Polygonum spp.) |
Category Four Weeds: (State watch list)
Plants prohibited for sale in or into Montana
Scotch broom |
(Cystisus scoparius) |
Category Five Weeds: (County declared noxious weeds)
Noxious weeds that are a problem in Gallatin County.
Meadow Knapweed |
(Centaurea pratensis Thuill.) |
Poison Hemlock |
(Conium maculatum L.) |
Musk Thistle |
(Cardus nutans L.) |
Scotch Thistle |
(Onopordum acanthium) |
Field scabious |
(Knautia arvensis) |
Scentless chamomile |
(Matricaria perorata) |
According to Montana State law it is unlawful for any person to permit any noxious weed to propagate or go to seed on the person's property. If it becomes necessary for the Weed District to institute control measures the property owner will be billed for labor, material, and equipment time at the current commercial rates plus a 50% penalty. Due date of payment for the bill is 30 days from the date the bill is sent. If the property owner does not pay the bill by the date due the cost will be entered as a special tax on the land. The property cannot be sold until the bill is paid.
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