Noxious weeds are non-native plants that disrupt native vegetation because they have no natural controls and are able to adapt to varied conditions. As a result of the Colorado Noxious Weed Act, these weeds have been placed on three separate lists.
List A Plants:
List B Plants:
Spread should be stopped
List C Plants:
Control is recommended
The Summit County Weed Brochure
(pdf) contains a list of noxious weeds found in Summit County and includes photos and characteristics to help identify noxious weeds. Call Summit County Weed Control at (970)668-4218 to inquire about the best method of eradication for each weed species.
If you are confused about whether or not your daisies are noxious, take a look at these photos
(pdf) - Oxeye Daisy and Scentless Chamomile are noxious weeds; Shasta Daisy is not!
Thistles - Native or Non-Native?
Colorado's native thistle species are valuable to pollinators, seed-feeders and browsing wildlife. However, several non-native species threaten agriculture and natural areas. Use this Thistle Identification and Management Guide
(pdf) to learn the difference between native and non-native thistles.