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• " Rangeland,pasture,and riparian site recommendations IP <br /> Colorado Department of Agriculture Plumeless thistle <br /> 305 Interlocken Pkwy Identification and Management <br /> Broomfield,CO 80021 <br /> (303)869-9030 lants over winter and grow from <br /> weeds@state.co.us ' <br /> P seeds and rosettes. The seed <br /> viability for Plumeless thistle is <br /> unknown. The site must be monitored <br /> for at least 10 years after the last <br /> flowering adult plants have been <br /> eliminated and treatments repeated <br /> { when necessary. <br /> The key to effective control of <br /> Plumeless thistle is very similar tj <br /> w to Musk thistle. Preventin Plumeless <br /> ,,. <br /> ` thistle seed production and planting <br /> desirable grasses and forbs to out <br /> .. compete plumeless thistle is effective. O <br /> An integrated weed management <br /> Identification and approach is an effective tool when <br /> dealing with plumeless thistle; using <br /> Impacts herbicide,biological and cultural <br /> control methods. Details on the <br /> ;';• ' back of this sheet can help to create <br /> r; lumeless thistle (Carduus a management plan compatible with <br /> P.2canthoides)is a winter annual your site ecology. <br /> or biennial that is native to Europe <br /> and Asia. Plumeless thistle rosettes <br /> have wavy leaves with yellow spines lumeless thistle is designated <br /> '�• � along the white-colored leaf margins. Pas a"List B"species in the <br /> The stems are covered with leaf-like, Colorado Noxious Weed Act. It <br /> winged spines that extend up to the is required to be either eradicated, <br /> flowering heads. The flower heads, contained,or suppressed depending <br /> ,. fx in clusters of 2 to 5,are alone at the on the local infestations. For more V <br /> end of the branches. They are purple information visit www.colorado. <br /> to dark red in color and are 1/2 to 1 ova csd and click on the Noxious <br /> inch in diameter. Leaves are alternate, Weed Management Program.Or call <br /> stalk-less,hairy underneath and the State Weed Coordinator at the <br /> blend into the stem. Mature plants Colorado Department of Agriculture, <br /> can grow taller than 5 feet and can Conservation Services Division, <br /> produce upwards of 9,000 seeds. 303-239-4100. <br /> Plumeless thistle <br /> Habitats for Plumeless thistle <br /> include pastures,fields, <br /> • _,• disturbed lands,logged-over areas, <br /> • river valleys,along roadsides and in <br /> - • • - • native grasslands. Plumeless thistle <br /> • . -• out competes native species and <br /> • • forage crops. It is one of the most <br /> aggressive thistles,due to its high <br /> seed production.Plumeless thistle is <br /> •• unpalatable to livestock and it may ��•_ m= ���-_�- r--o�r- <br /> • accumulate nitrates. a <br /> Photos O Map above:Crystal Andrews,Colorado <br /> Department of Agriculture;All other photos:Kelly <br /> Updated on: Uhing,Colorado Department of Agriculture. <br /> 07/2015 <br />