Category I noxious weeds are weeds that are currently established and generally widespread in many counties of the state. Management criteria include awareness and education, containment and suppression of existing infestations and prevention of new infestations. These weeds are capable of rapid spread and render land unfit or greatly limit beneficial uses.

Noxious Weed Species Common Name
Scientific Name
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
Dalmatian Toadflax Linaria dalmatica
St. Johnswort Hypericum perforatum
Sulfur Cinquefoil Potentilla recta
Common Tansy Tanacetrm vulgare
Oxeye-daisy Chrysanthemum leucanthemun
Houndstongue Cynoglossum officinale
Yellow Toadflax Linaria vulgaris
Hoary Alyssum Berteroa incana