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Noxious Weed Program

Town of Fraser Noxious Weed Program

Mission and Resources

The Town of Fraser is committed to protecting the native plant communities, wildlife and water resources within its jurisdiction. The goal of noxious weed control will be achieved by raising public awareness through education, suppression and eradication of existing noxious weed populations, and preventing further spread of noxious weed growth into future areas.

The Town of Fraser implements its noxious weed program based on a mandate from the state. Click on this link to view the Colorado Noxious Weed Act. The state Agricultural Commissioner’s office maintains lists of noxious plants divided according to the following: List A – species new or not yet present in the state but proven threats to surrounding states, List B – species more common and widespread and List C – species so numerous and common that the goal is containment to present boundaries.

The Town, because of its location within Grand County, complies with Grand County's Noxious Weed mandate from The Colorado Department of Agriculture to control and reduce the spread of noxious weeds in Grand County. The Grand County Department of Natural Resources has provided a plant list from the above mentioned Colorado ABC listing of Noxious Weeds found in Fraser town limits, which are mandatory to be controlled if identified. Fortunately, there are limited List A weeds; however, there are several List B weed communities currently growing in Town that are detrimental to the native ecosystems and pose a threat of proliferation in new areas of development.

The Town Noxious Weed Program

Within the current Municipal Code, The Town of Fraser’s Noxious Weed Program names only a few of these plants:  leafy spurge, Russian knapweed, spotted knapweed and diffuse knapweed. This list expands, by virtue of the State mandate, to include those plants on the state noxious weeds lists. These plants have spread to our area. Other weeds on the state list can migrate to our area at any time by any means, such as within seed mixes, within soil brought in for landscaping and even within plants purchased at a nursery.

Knowledge and awareness are keys to the success of any effort. This is especially true when keeping the proliferation of noxious weeds at a manageable level.

It is not only helpful to know which weeds are noxious but also what methods are effective in eradicating them. Here are a few items of interest regarding some of the more commonly found noxious weeds in our area:

Scentless ChamomileScentless Chamomile – this plant is biennial - it only lives two years. The first year is vegetative; the second year, it blooms and later dies. During the second year, after the blooms drop, the viable seeds spread via wind, birds, and human activity. If pulled during the first year, it can be destroyed. When the plant blooms it can still be pulled and the plant will be destroyed. However, once the seeds drop, the plant cycle begins anew. The seed of scentless chamomile may remain viable in the soil for 4-6 years and a single plant can produce 960,000 seeds in one season! Eradicate this weed from your home garden by pulling it each year as you notice its growth or by chemicals labeled for use at an early growth stage.

Canada ThistleCanada thistle – this perennial plant comes back every year, for as many years as it can survive. Because of its extensive root system, simply pulling the part of the plant above ground does nothing to destroy the plant below ground. Systemic herbicides, which attack the root system, are the only sure method of destroying this plant.

Oxeye DaisyOxeye daisy
– is also perennial. Its flowers are similar to chamomile, but its leaves are serrated, not fringed as are those of the chamomile. It is also similar to the Shasta daisy, which, although not native, is not particularly aggressive at this time. Like Canada thistle, the oxeye daisy survives year after year; however, its roots are not as deep so digging up the plant’s roots is an effective mechanical (or cultural) method of destroying this plant. Do not plant as an ornamental.

Common TansyCommon tansy – is also perennial. This plant is common in Fraser, and is sometimes found in flowerbeds or used as a hedge. Some think it resembles the yarrow plant. It was introduced as an ornamental; however, due to its aggressive nature, it has escaped and is taking over native plants. It can be destroyed only by systemic herbicides. The State has specifically requested eradication of this plant in Fraser because ours is one of the few locations in Grand County where it is found. Ultimately, the goal is to have common tansy eradicated state-wide by 2016.

 Some plants placed in gardens for ornamental purposes are so suited to the habitat that they easily spread outside the bounds of the garden, eliminating less aggressive plants in their wake. This has been the case here in the Fraser Valley, especially with the pleasant looking oxeye daisy.

Plan of Action & Methods

The Town of Fraser has established a management plan to control noxious weeds on Town properties, rights of way, parks, service areas and watershed regions, commercial and residential areas. Integrated Management principles (biological, chemical, cultural and mechanical management) and the fundamentals of Best Management Practices to prevent non point-source contamination of water resources will be utilized to attain the goal of noxious weed control.

The Town complies with the State of Colorado Noxious Weed Act, the Environmental Protection Agency and the State Agriculture Department guidelines with the cooperation of the Grand County Department of Natural Resources.

The Town of Fraser uses herbicides to treat noxious weeds on Town properties. These applications occur during the the summer months in the right of way, along the Fraser river trail, around the Lions Ponds, the paved bike path between Fraser and Winter Park, Rendezvous Park, the water treatment plants and other Town properties.

Currently, the Town is using the following herbicides to control weeds on Town-owned properties:  
Dow products Milestone® Specialty Herbicide and Chaparral™, and DuPont products Escort and Telar.

To learn more about each of these products, visit  the Crop Data Management Systems website, click on Services and choose the Manufacturer first, then the product name from the listings.  

 Noxious Weed Plant Lists

(To view photos of these noxious weeds, go to the Colorado Department of Agriculture website and click on the plant name)

 Noxious Weeds, previously identified in Fraser proper (mandatory to be controlled):

Canada thistle (Cirsium arvense) List B*
Common tansy (Tanacetum vulgare) List B
Dame’s rocket (Hesperis matronalis) List B
Downy brome or Cheatgrass (Bromus tectorum) List C*
Field bindweed (Convulvulus arvensis) List C
Mayweed chamomile (Anthemis cotula) List B
Musk thistle (Carduus natans) List B
Orange hawkweed (Heircacium aurantiacum) List A*
Oxeye daisy (Chrysanthemum leucanthemum) List B
Scentless chamomile (Anthemis arvensis) List B
Yellow toadflax (Linaria vulgaris) List B

Additional noxious Weeds in Grand County (mandatory to be controlled):

Black henbane (Hyscocyamus niger) List B
Bull thistle (Cirsium vulare) List B
Cypress spurge (Euphorbis syparissias List A
Plumeless thistle (Carduus acanthoides) List B
Dalmatian toadflax (Linaria dalmatica) List B
Diffuse knapweed (Centaurea diffusa) List B
Dyer’s woad (Isatis tinctoria) List A
Giant salvinia (Alvinia molesta) aquatic List A
Hoary cress or Whitetop (Cardaria draba) List B
Hydrilla (Hydrilla verticillata) aquatic List A
Leafy spurge (Euphorbia esula) List B
Houndstongue (Cynoglossum officinale) List B
Meadow knapweed (Centaurea pratensis) List A
Myrtle spurge (Euphorbia myrsinites) List A
Purple loosestrife (Lythrum salicaria) List A
Rush skeletonweed (Chondrilla juncea) List A
Russian knapweed (Centaurea repens) List B
Scotch thistle (Onopordum acanthium & tauricum) List B
Spotted knapweed (Centaurea pratensis) List B
Tansy ragwort (senecio jacobaea) List A
Yellow starthistle (Centaurea solstitialis) List A

View the entire Colorado Noxious Plant Lists A, B and C at the Colorado State Agriculture Commissioner’s website.

Helpful Links:



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Last updated: 5/1/2017 2:27:36 PM