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Noxious weeds


(Black Henbane) a type of invasive weed found in Costilla County along with

a few others named Toadflax and Cypress Spurge

Christopher Benton, Costilla Conservation District Technician (DCT)

719-672-3673 ext-104

903 Main Street

San Luis, CO


All noxious weeds are non-native species.  They become listed by the State weed advisory board as a noxious weed when it meets one or more of the following criteria:

  • Aggressively invades or is detrimental to economic crops or native plant communities.
  • Poisonous to livestock.
  • The direct or indirect effect of the presence of this plant is detrimental environmentally to natural or agricultural ecosystems.

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

See information about Colorado's Noxious Weed Management Program: