![](https://gilpin.extension.colostate.edu/wp-content/uploads/sites/29/2024/04/Canada-Thistle-576x1024.jpg)
Canada thistle (Cirsium (Breea) arvense)
Please note that there are some native thistles, which are not noxious plants.
Other Links For Further Information:
http://extension.colostate.edu/topic-areas/natural-resources/canada-thistle-3-108/
Visits are by appointment only.