They are typically introduced to an area, often times from a different continent, and would not occur there in a sound natural habitat.
Noxious weeds can be very disruptive, and have potential to take over complete plant communities.
The control of these species is very difficult, due to their ability to adapt to an ecosystem relatively quickly. A management plan for the Pike and San Isabel National Forests and the Cimarron and Comanche National Grasslands is currently in place for the control of noxious weeds. This plan identifies the preferred way to control these species. The focus here is to identify portions of the assessment area that the noxious weeds are known to occur or have potential to occur. Methodology An examination of the occurrence and distribution of exotic and invasive plants, or noxious weeds within the assessment area was performed.