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The State Noxious Weed List

The following weed species, listed in alphabetical order, are identified as the State Noxious Weeds. They have been identified by individual counties as problem weeds in the county's area or have been recommended for management through public testimony. These weed species should be considered by each local advisory board and local governing body in the development, adoption and enforcement of their noxious weed list and noxious weed management plan.

Click below on linked weeds to view profiles

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To view profiles, images, or maps of the listed noxious weeds, click on the image links to the right.

Name
Profile
Image
Map
Absinth wormwood (Artemisia absinthium)†
African rue (Peganum harmala)†
Not Available
Not Available
Black henbane (Hyoscyamus niger)
Black nightshade (Solanum nigrum)
Not Available
Blue mustard (Chorispora tenella)
Not Available
Bouncingbet (Saponaria officinalis)†
Bull thistle (Cirsium vulgare)
Not Available
Camelthorn (Alhagi pseudalhagi)†
Not Available
Not Available
Canada thistle (Cirsium arvense)*
Not Available
Chicory (Cichorium intybus)
Not Available
Chinese clematis (Clematis orientalis)
Not Available
Coast tarweed (Madia sativa)†
Not Available
Not Available
Common burdock (Arctium minus)
Not Available
Common crupina (Crupina vulgaris)†
Not Available
Not Available
Common groundsel (Senecio vulgaris)
Not Available
Not Available
Common mullein (Verbascum thapsus)
Common St. Johnswort (Hypericum perforatum)
Common tansy (Tanacetum vulgare)
Common teasel (Dipsacus fullonum)†
Cypress spurge (Euphorbia cyparissias)†
Dalmatian toadflax, broad-leaved (Linaria dalmatica)*
Not Available
Dalmation toadflax, narrow-leaved (L. genistifolia)*
Not Available
Dame's rocket (Hesperis matronalis)
Not Available
Diffuse knapweed (Centaurea diffusa)*
Downy brome (Bromus tectorum)
Not Available
Dyer's woad (Isatis tinctoria)†
Not Available
Eurasian watermilfoil (Myriophyllum spicatum)†
Not Available
Field bindweed (Convolvulus arvensis)*
Flixweed (Descurainia sophia)
Giant salvinia (Salvinia molesta)†
Not Available
Not Available
Green foxtail (Setaria viridis)
Not Available
Hairy nightshade (Solanum sarrachoides)
Not Available
Not Available
Halogeton (Halogeton glomeratus)
Not Available
Hoary cress (Cardaria draba)*
Houndstongue (Cynoglossum officinale)*
Hydrilla (Hydrilla hydrilla)†
Not Available
Not Available
Johnson grass (Sorghum halepense)
Not Available
Jointed goatgrass (Aegilops cylindrica)
Not Available
Kochia (Kochia scoparia)
Not Available
Leafy spurge (Euphorbia esula)*
Not Available
Mayweed chamomile (Anthemis cotula)
Not Available
Meadow knapweed (Centaurea pratensis)†
Not Available
Not Available
Mediterranean sage (Salvia aethiopis)†
Not Available
Medusahead rye (Taeniatherum caput-medusae)†
Not Available
Not Available
Moth mullein (Verbascum blattaria)†
Not Available
Musk thistle (Carduus nutans)*
Myrtle spurge (Euphorbia myrsinites)†
Not Available
Orange hawkweed (Hieracium aurantiacum)†
Not Available
Oxeye daisy (Chrysanthemum leucanthemum)
Not Available
Perennial pepperweed (Lepidium latifolium)
Not Available
Perennial sowthistle (Sonchus arvensis)
Not Available
Plumeless thistle (Carduus acanthoides)
Not Available
Poison hemlock (Conium maculatum)
Not Available
Puncturevine (Tribulus terrestris)
Not Available
Purple loosestrife (Lythrum salicaria)
Not Available
Quackgrass (Elytrigia repens)
Not Available
Redstem filaree (Erodium cicutarium)
Not Available
Rush skeletonweed (Chondrilla juncea)†
Not Available
Not Available
Russian knapweed (Centaurea repens)*
Russian-Olive (Elaeagnus angustifolia)
Not Available
Russian thistle (Salsola collina and S. iberica)
Not Available
Saltcedar (Tamarix parviflora and T. ramosissima)
Not Available
Scentless chamomile (Anthemis arvensis)
Not Available
Scotch thistle (Onopordum acanthium and O. tauricum)
Not Available
Sericea lespedeza (Lespedeza cuneata)†
Not Available
Not Available
Shepherdspurse (Capsella bursa-pastoris)
Not Available
Spotted knapweed (Centaurea maculosa)
Not Available
Spurred anoda (Anoda cristata)†
Not Available
Not Available
Squarrose knapweed (Centaurea virgata)†
Not Available
Not Available
Sulfur cinquefoil (Potentilla recta)†
Not Available
Swainsonpea (Sphaerophysa salsula)
Not Available
Tansy ragwort (Senecio jacobaea)†
Not Available
Not Available
Velvetleaf (Abutilon theophrasti)
Not Available
Venice mallow (Hibiscus trionum)†
Not Available
Wild caraway (Carum carvi)
Not Available
Wild mustard (Brassica kaber)
Not Available
Wild oats (Avena fatua)
Not Available
Wild proso millet (Panicum miliaceum)
Not Available
Yellow foxtail (Setaria glauca)
Not Available
Not Available
Yellow nutsedge (Cyperus esculentus)
Not Available
Yellow starthistle (Centaurea solstitialis)†
Not Available
Yellow toadflax (Linaria vulgaris)*
Not Available

* - Weeds marked with an asterisk (*) are recognized as the top ten prioritized weed species for the State of Colorado. After analysis of a statewide survey of counties, these species are acknowledged to be the most widespread and to cause the greatest economic impact in the State of Colorado. These species shall be considered by each local advisory board and local governing body in the development, adoption and enforcement of their noxious weed list and noxious weed management plan.

† - Weeds marked with an cross (†) may not be present or are not yet widespread or causing great economic impact within the State of Colorado. However, counties and local advisory boards are encouraged to contain and eradicate these species before they proliferate and significantly impact the economic and environmental values of the lands of the State.

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