Noxious Weed Program

MISSION STATEMENTThe mission of the Montezuma County Noxious Weed Program is to implement a coordinated undesirable plant program utilizing integrated management methods to ensure that all lands within Montezuma County are effectively managed to meet the intent of the Colorado Noxious Weed Act. Management methods include, but are not limited to: education, prevention, good land stewardship, biological, chemical, cultural, and mechanical.

Noxious Weed Program's goal

The weed program’s goal is to provide noxious weed management utilizing the following practices:

  • Assist landowners with noxious weed problems through plant identification, weed management recommendations, and development of vegetation management plans.
  • Promote noxious weed education and awareness by way of community presentations, site visits, literature distribution, newspaper articles, and maintenance of on-line information sources on the County Website.
  • Manage noxious weeds on county property and roadside rights-of-way.
  • Coordinate efforts with landowners, land management agencies, and neighboring counties.
  • Identify and contain, reduce or eradicate current weed infestations and reduce or eliminate weed seed production in certain species.
  • Monitor for new infestations and new invasive species so as to prevent new encroachments on unincorporated lands in the County.

Non-Native Phreatophyte Project - McElmo Creek.


As a landowner, you take pride in your property and have an obligation to both yourself and your neighbors to manage noxious weeds on your land. Noxious weeds crowd out native species and take over native ecosystems, which causes unsightly weed infestations and degrades the value of your property.

If an infestation is caught in the early stages, it can be relatively inexpensive to control and possible to eradicate entirely. If left untreated a small infestation can spread and displace native plants; leaving a land that is degraded, has a lowered property value, and is very costly to treat.  Often, it takes several years of repetitious treatment to manage a weed infestation.

Need help identifying a weed?

Try this Weed Identification Tool from the Colorado Weed Management Association.


List A Species:

Designated for eradication. Click here to download the list

(species that are in BOLD are species known to be in Montezuma County)

  • Black henbane
  • Common tansy
  • Cypress spurge
  • Cutleaf teasel
  • Diffuse knapweed
  • Giant reed
  • Hairy willow-herb
  • Hybrid knapweed
  • Hybrid toadflax
  • Knotweeds
  • Leafy spurge
  • Mediterranean sage
  • Myrtle spurge
  • Orange hawkweed
  • Purple loosestrife
  • Spotted knapweed
  • Yellow toadflax
List B Species:

Designated for control and suppression on all lands within Colorado.

(species that are in BOLD are species known to be in Montezuma County).

  • Absinth wormwood
  • Bouncingbet
  • Bull thistle
  • Canada thistle
  • Chinese clematis
  • Common teasel
  • Corn chamomile
  • Dalmatian toadflax
  • Dame’s rocket
  • Eurasian watermilfoil
  • Halogeton
  • Hoary Cress
  • Houndstongue
  • Jointed goatgrass
  • Mayweed chamomile
  • Moth mullein
  • Musk thistle
  • Oxeye daisy
  • Perennial Pepperweed
  • Plumeless thistle
  • Russian knapweed
  • Russian-olive
  • Salt cedar
  • Scentless chamomile
  • Scotch thistle
  • Sulfur cinquefoil
  • Wild caraway
  • Yellow nutsedge
List C Species:

Recommended for control and suppression on all lands within Colorado.

(species that are in BOLD are species known to be in Montezuma County).

  • Bulbous bluegrass
  • Chicory
  • Common burdock
  • Common mullein
  • Common St.Johnswort
  • Downy brome
  • Field bindweed
  • Johnsongrass
  • Perennial sowthistle
  • Poison hemlock
  • Puncturevine
  • Quackgrass
  • Redstem filaree
  • Velvetleaf
  • Wild-proso millet

Report weed infestations

If you see noxious weeds on any Montezuma County road and can correctly identify the species, fill out the form below

Contact Montezuma County Weed Manager
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