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Noxious Weeds - List B
Clear Creek County Noxious Weed Lists - February 5, 2015

All populations of List B species are designated for "management" unless "designated for eradication." List B species must be managed in accordance with all the provisions of this Section, including any applicable state noxious weed management plans. Bold font indicates the species is in Clear Creek County.

(Note: ~ Tilde symbol indicates species is "designated" for eradication in Clear Creek County) 

List B Weeds:

~ Absinth Wormwood (Artemisia absinthium)
~ Black henbane (Hyoscyamus niger)
~ Bouncingbet (Saponaria officinalis)
~ Bull Thistle (Cirsium vulgare)
~ Canada Thistle (Cirsium arvense)
~Chamomile (Scentless)
~ 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)
~ Dames Rocket (Hesperis matronalis)
~ Diffuse Knapweed (Centaurea diffusa)
Eurasian watermilfoil (Myriophyllum spicatum)
~ 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)
~ Oxeye Daisy (Chrysanthemum leucanthemum)
~ Perennial Pepperweed (Lepidium latifolium)
Plumeless thistle (Carduus acanthoides)
Quackgrass (Elytrigia repens)
~ Russian Knapweed (Acroptilon repens)
~ Russian Olive (Elaeagnus angustifolia)
Salt cedar (Tamarix chinensis, T.parviflora, and T. ramosissima)
~ Scentless Chamomile (Matricaria perforata)
~ Scotch Thistle (Onopordum acanthium)
~ Spotted Knapweed (Centaurea maculosa)
Sulfur cinquefoil (Potentilla recta)
Wild caraway (Carum carvi)
Yellow nutsedge (Cyperus esculentus)
~ Yellow Toadflax (Linaria vulgaris

Size and Location
All landowners and land managers with priority weed species are required
to implement the following minimal management strategies.

(a) Isolated small populations of one acre or less: Intensive best
management practies applied with eradication goals in mind.
Prevent seed formation and root spread on an annual basis.

(b) Satellite populations (one acre or less) proximate to larger populations: Intensive best management practices applied with eradication, containment, and reduction goals in mind. Prevent seed formation and root spread on an annual basis.

(c) Large populations of more than one acre: Use of effective, best management practices. Apply containment and perimeter buffering management practices at a minimum of fifty feet wide each growing season. Prevent seed formation and root spread on an annual basis.

Additionally, containment and perimeter buffering/reduction practices shall be stepped inward toward the center of the infestation at a minimum of fifty feet wide each season thereafter until the desired goals of the weed management plan have been met. 


Priority Management Areas Consists of:
(a) Infestations adjacent to property lines, easements, rights of ways, ditches, canals, streams, rivers, creeks, trails, wildlife migration routes, private and public roadways. Buffering will be required each growing season and applied to the entire perimeter of the infestation at a minimum of fifty feet wide at the proper timing in order to prevent seed formation and root spread. Annual stepped in buffering and reduction management is required.