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 The District has a noxious Weed Control Service, now in its fourteenth year. The program provides education, consultation and eradication, suppression and management of Colorado List A,B and C species of weeds using a variety of herbicides. At the current time, the primary focus areas are rights-of-way along roads under the jurisdiction of Saguache County and portions of highways in the San Luis Valley under the jurisdiction of Colorado DOT. For more information, contact Conservation Technician, Lamar Taylor at This e-mail address is being protected from spambots. You need JavaScript enabled to view it or District Manager, Brenda Anderson at  This e-mail address is being protected from spambots. You need JavaScript enabled to view it or call the office at 719-754-3400. 





A "weed" is "a plant out of place," or a plant growing where it is not wanted.

According to the Colorado Noxious Weed Act (C.R.S. 35-5.5), a "Noxious weed" is an aggressive invader or is detrimental to economic crops or native plant communities; is poisonous to livestock; is a carrier of detrimental insects, diseases, or parasites; and is directly or indirectly detrimental to the environmentally sound management of natural or agricultural ecosystems.

Noxious weeds can invade cropland, pastures, homesites and native ecosystems. If left unchecked, they can adversely affect crop production and reduce the amount of desirable forage available for livestock and wildlife. Some noxious weeds are even poisonous or hazardous in other ways to animals and/or humans. Additionally, depending on management objectives, a plant may be considered a weed in one area but not in others.

In Colorado, noxious weeds are categorized as follows:

List A plants—designated for elimination on all County, State, Federal and Private lands
List B plants—includes plants whose continued spread should be stopped
List C plants—selected for recommended control methods

Management of noxious weeds includes the following methods:

  • Biological management: the use of an organism, such as insects, to disrupt the growth of a noxious weed.
  • Chemical management: the use of herbicides or pesticides or plant growth regulators to disrupt the growth of a noxious weed.
  • Cultural management: methodologies or management practices that favor the growth of desirable plants over noxious weeds.
  • Mechanical management: any method or practice that physically disrupts the growth of a noxious weed.

All noxious weeds are invasive due to the lack of natural insects and diseases to keep their populations in check. 

The invasive weeds listerd below are the species of primary concern in Saguache County and in the District area.  Click on the weed name to see an information sheet:

The following is a list of noxious weeds that have been observed in the District area, but are less populous than those listed above.  They are, however, of no less concern.  Click on the weed name to see an information sheet.

 Click on the links below for more information about Colorado's Noxious Weed Management Program: