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This PlantTalk Colorado script discusses Canada thistle. ... Canada thistle, a noxious weed common in Colorado, is an aggressive and creeping perennial that spreads from its root system. Shoots become 1 to 3 feet tall and its purple flowers are about the size of a dime. It can also be recognized by its spiny leaves and stems.
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www.ext.colostate.edu/ptlk/2102.html
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Canada Thistle: Cirsium arvense ... Weed Description: Perennial by rhizomes, 2 to 6 feet in height. Often a persistent spreading weed ... The flowers of Canada thistle do not have spines or prickles unlike bull or musk thistle. Stems are also spineless unlike Bull Thistle (Cirsium vulgare) or Musk Thistle (Carduus nutans).
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www.ppws.vt.edu/scott/weed_id/cirar.htm
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Cirsium arvense - Wikipedia, the free encyclopedia
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Cirsium arvense is a species of Cirsium , native throughout Europe and northern Asia, and widely introduced elsewhere. The standard English name in its native area is Creeping Thistle . A numbe...
en.wikipedia.org/wiki/Cirsium_arvense
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A species profile for Canada Thistle from USDA's National Invasive Species Information Center. ... Canada Thistle - Vegetation Management Guideline; Illinois Nature Preserves Commission.; Identification-Description; Photographs; Impacts; Life cycle; Distribution; Controls...
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www.invasivespeciesinfo.gov/plants/canthistle.shtml
www.invasivespeciesinfo.gov/plants/canthistle.shtml
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The small, dry, single-seeded fruits of Canada thistle, called achenes, are 1-1½ inches long and have a feathery structure attached to the seed base. Many native species of thistle occur in the U.S., some of which are rare.
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www.nps.gov/plants/alien/fact/ciar1.htm
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Canada thistle, Cirsium arvense (L.) Scop. (Fig. 1), is a vigorous, competitive weed that occurs in a wide range of habitats and is difficult to control due to its ability to regrow from its extensive, deep creeping root system (Nadeau and Vanden Born, 1989).
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www.invasive.org/eastern/biocontrol/17CanadaThistle.htm...
www.invasive.org/eastern/biocontrol/17CanadaThistle.html
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Canada Thistle ; (Cirsium arvense) ... Annual Bluegrass; Baby's-Breath; Barnyardgrass; Bladder Campion; Blueweed; Bog Rush; Bull Thistle; Burdock; Canada Thistle; Chicory; Chickweed; Cleavers; Cluster Tarweed; Common Bugloss; Common Tansy; Common Mallow; Corn Spurry; Creeping Buttercup; Crupina; Cudweed; Curled Dock;
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www.agf.gov.bc.ca/cropprot/weedguid/canthist.htm
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A PLANTS profile of Cirsium arvense (Canada thistle) from the USDA PLANTS database ... Cirsium arvense (L.) Scop. Canada thistle; ... Californian thistle; Canada thistle creeping thistle field thistle; Cirsium thistle;
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plants.usda.gov/java/profile?symbol=CIAR4
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GENERAL CHARACTERISTICS OF CANADA THISTLE ... Canada thistle is a cool season perennial which spreads by seed and vegetatively by creeping roots. In Indiana, Canada thistle normally initiates growth in spring, reaches the flower-bud stage the first week in June, and full flower about the third week of June.
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www.btny.purdue.edu/Pubs/WS/CanadaThistle/CanadaThistle...
www.btny.purdue.edu/Pubs/WS/CanadaThistle/CanadaThistle.html
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