Colorado Department of Agriculture
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Noxious Weed List

Noxious Weed Management Program
Colorado Noxious Weed List pdf file

The lists of Colorado's Noxious Weeds are located in the below table. 

  • To view the differences in listing species
    • Click on the list below (either A, B, or C) and the answer will drop down, click again to close the answer
  • To view more about a specific weed
    • Click on the name in blue text
  • To view pictures

 
  • List A species

    List A species in Colorado that are designated by the Commissioner for eradication.
  • List B species

    List B weed species are species for which the Commissioner, in consultation with the state noxious weed advisory committee, local governments, and other interested parties, develops and implements state noxious weed management plans designed to stop the continued spread of these species.
  • List C species

    List C weed species are species for which the Commissioner, in consultation with the state noxious weed advisory committee, local governments, and other interested parties, will develop and implement state noxious weed management plans designed to support the efforts of local governing bodies to facilitate more effective integrated weed management on private and public lands. The goal of such plans will not be to stop the continued spread of these species but to provide additional education, research, and biological control resources to jurisdictions that choose to require management of List C species.

 

 

 

Sort the information by clicking the column you want to sort by. 

Common Name

Scientific Name

List (Classification)
African rue Peganum harmala List A
Camelthorn Alhagi pseudalhagi List A
Common crupina Crupina vulgaris List A
Cypress spurge Euphorbia cyparissias List A
Dyer's woad Isatis tinctoria List A
Giant salvinia Salvinia molesta List A
Hydrilla Hydrilla verticillata List A
Meadow knapweed Centaurea pratensis List A
Mediterranean sage Salvia aethiopis List A
Medusahead Taeniatherum caput-medusae List A
Myrtle spurge Euphorbia myrsinites List A
Orange hawkweed Hieracium aurantiacum List A
Purple loosestrife Lythrum salicaria List A
Rush skeletonweed Chondrilla juncea List A
Sericea lespedeza Lespedeza cuneata List A
Squarrose knapweed Centaurea virgata List A
Tansy ragwort Senecio jacobaea List A
Yellow starthistle Centaurea solstitialis List A
Absinth wormwood Artemisia absinthium List B
Black henbane Hyoscyamus niger List B
Bouncingbet Saponaria officinalis List B
Bull thistle Cirsium vulgare List B
Canada thistle Cirsium arvense List B
Chinese clematis Clematis orientalis List B
Common tansy Tanacetum vulgare List B
Common teasel Dipsacus fullonum List B
Corn chamomile Anthemis arvensis List B
Cutleaf teasel Dipsacus laciniatus List B
Dalmatian toadflax- broad leaved Linaria dalmatica List B
Dalmatian toadflax- narrow leaved Linaria genistifolia List B
Dame's rocket Hesperis matronalis List B
Diffuse knapweed Centaurea diffusa List B
Eurasian watermilfoil Myriophyllum spicatum List B
Hoary cress Cardaria draba List B
Houndstongue Cynoglossum officinale List B
Leafy spurge Euphorbia esula List B
Mayweed chamomile Anthemis cotula List B
Moth mullein Verbascum blattaria List B
Musk thistle Carduus nutans List B
Oxeye daisy Chrysanthemum leucanthemum List B
Perennial pepperweed Lepidium latifolium List B
Plumeless thistle Carduus acanthoides List B
Quackgrass Elytrigia repens List B
Redstem filaree Erodium cicutarium List C
Russian knapweed Acroptilon repens List B
Russian-olive Elaeagnus angustifolia List B
Salt cedar Tamarix chinensis, T. parviflora, and T. ramosissima List B
Scentless chamomile Matricaria perforata List B
Scotch thistle Onopordum acanthium List B
Scotch thistle Onoporfum tauricum List B
Spotted knapweed Centaurea maculosa List B
Spurred anoda Anoda cristata List B
Sulfur cinquefoil Potentilla recta List B
Venice mallow Hibiscus trionum List B
Wild caraway Carum carvi List B
Yellow nutsedge Cyperus esculentus List B
Yellow toadflax Linaria vulgaris List B
Chicory Cichorium intybus List C
Common burdock Arctium minus List C
Common mullein Verbascum thapsus List C
Common St. Johnswort Hypericum perforatum List C
Downy brome Bromus tectorum List C
Field bindweed Convolvulus arvensis List C
Halogeton Halogeton glomeratus List C
Johnsongrass Sorghum halepense List C
Jointed goatgrass Aegilops cylindrica List B
Perennial sowthistle Sonchus arvensis List C
Poison hemlock Conium maculatum List C
Puncturevine Tribulus terrestris List C
Velvetleaf Abutilon theophrasti List C
Wild proso millet Panicum miliaceum List C