Noxious Weed List

These are the noxious weeds that are mandatory to control under the Colorado Noxious Weed Act.

The State of Colorado Noxious Weed List

The following weed species were identified by individual Colorado counties as problem weeds or were recommended for management through public testimony.

Those in Bold are enforceable in La Plata County

List A species in Colorado are designated by the Commissioner for eradication:
Absinth wormwood (Artemisia absinthium)

African rue (Peganum harmala)
Black henbane (Hyoscyamus niger)
Camelthorn (Alhagi pseudalhagi)
Common crupina (Crupina vulgaris)
Cypress spurge (Euphorbia cyparissias)
Diffuse knapweed (Centaurea diffusa)

Dyer's woad (Isatis tinctoria)
Giant salvinia (Salvinia molesta)
Hydrilla (Hydrilla verticillata)
Meadow knapweed (Centaurea pratensis)

Mediterranean sage (Salvia aethiopis)
Medusahead (Taeniatherum caput-medusae)

Myrtle spurge (Euphorbia myrsinites)
Perennial pepperweed (Lepidium latifolium)

Plumeless thistle (Carduus acanthoides)
Purple loosestrife (Lythrum salicaria)
Rush skeletonweed (Chondrilla juncea)

Sericea lespedeza (Lespedeza cuneata)

Squarrose knapweed (Centaurea virgata)
Tansy ragwort (Senecio jacobaea)
Yellow starthistle (Centaurea solstitialis)

 

List B noxious weed species have (or will have) a state noxious weed management plan developed to stop their spread.
Bouncingbet (Saponaria officinalis)
Bull thistle (Cirsium vulgare)

Canada thistle (Cirsium arvense)
Chinese clematis (Clematis orientalis)
Common tansy (Tanacetum vulgare)
Common teasel (Dipsacus fullonum)
Corn chamomile (Anthemis arvensis)
Cutleaf teasel (Dipsacus laciniatus)
Dalmatian toadflax, broad-leaved (Linaria dalmatica)
Dalmatian toadflax, narrow-leaved (Linaria genistifolia)
Hoary cress (Cardaria draba)
Houndstongue (Cynoglossum officinale)

Jointed goatgrass (Aegilops cylindrica)
Leafy spurge (Euphorbia esula)
Mayweed chamomile (Anthemis cotula)
Moth mullein (Verbascum blattaria)
Musk thistle (Carduus nutans)
Orange hawkweed (Hieracium aurantiacum)
Oxeye daisy (Chrysanthemum leucanthemum)
Quackgrass (Elytrigia repens)

Russian knapweed (Acroptilon repens)

Russian-olive (Elaeagnus angustifolia)

Scentless chamomile (Matricaria perforata)
Scotch thistle (Onopordum acanthium L.)

Spotted knapweed (Centaurea maculosa)
Spurred anoda (Anoda cristata)
Sulfur cinquefoil (Potentilla recta)

Tamarisk (Tamarix chinensis, T.parviflora, and T. ramosissima)

Venice mallow (Hibiscus trionum)
Wild caraway (Carum carvi)
Yellow nutsedge (Cyperus esculentus)

Yellow toadflax (Linaria vulgaris)

List C noxious weed species:

Resources will be provided to jurisdictions that choose to require management of these species.

Chicory (Cichorium intybus)
Common burdock (Arctium inus)
Common mullein (Verbascum thapsus)
Common St. Johnswort (Hypericum perforatum)
Downy brome (Bromus tectorum)
Field bindweed (Convolvulus arvensis)
Halogeton (Halogeton glomeratus)
Johnsongrass (Sorghum halepense)
Perennial sowthistle (Sonchus arvensis)
Poison hemlock (Conium maculatum)
Puncturevine (Tribulus terrestris)

Redstem filaree (Erodium cicutarium)
Velvetleaf (Abutilon theophrasti)
Wild proso millet (Panicum miliaceum)