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Canada Thistle Identification and Management <br /> its root system, and quickly form <br /> dense stands. Each fragmented <br /> - piece of root, 0.25 inch or larger, is <br /> capable of forming new plants. The ► , <br /> key to controlling Canada thistle is <br /> _ to eliminate seed production and to <br /> reduce the plant's nutrient reserves <br /> in its root system through persistent, <br /> long-term management. <br /> Canada thistle is one of the most ` ` ' <br /> troublesome noxious weeds in *� `` <br /> the U.S. It can infest diverse land , <br /> types, ranging from roadsides, ditch <br /> banks, riparian zones, meadows, ; <br /> Canada thistle (Cirsium arvense) pastures, irrigated cropland, to the �► <br /> is a non-native, deep-rooted most productive dryland cropland. <br /> perennial that spreads by seeds and Large infestations significantly reduce <br /> aggressive creeping, horizontal roots crop and cattle forage production <br /> called rhizomes. Canada thistle can and native plant species. It is a host <br /> grow 2 to 4 feet in height. The leaves plant to several agricultural pests and <br /> are oblong, spiny, bright green, and diseases. Canada thistle prefers moist AA <br /> slightly hairy on the undersurface. soils, but it can be found in a variety <br /> Unlike other noxious biennial thistles of soil types. It has been found at <br /> which have a solitary flower at the elevations up to 12,000 feet. <br /> end of each stem, Canada thistle ���. � <br /> flowers occur in small clusters of 1 ffective Canada thistle control <br /> to 5 flowers. They are about 1 cm in E <br /> diameter, tubular shaped, and vary requires a combination of <br /> from white to purple color. methods. Prevention is the most �+-� ��• " <br /> important strategy. Maintain healthy S] <br /> pastures and rangelands, andAf <br /> "� <br /> Canada thistle emerges from continually monitor your property for # I <br /> its root system from late April new infestations. Established plants <br /> through May. It flowers in late spring need to be continually stressed. , toy <br /> and throughout the summer. It Management options become limited =30 <br /> produces about 1,000 to 1,5oo seeds once plants begin to produce seeds. rj/1 <br /> per plant that can be wind dispersed. Details on the back of this sheet can r'` SdLcU�J <br /> Seeds survive in the soil for up to 20 help to create a management plan <br /> years.Additionally, Canada thistle compatible with your site ecology. _ <br /> reproduces vegetatively through <br /> anada thistle is <br /> 2013 Quarter Quad Survey designated as a "List P• <br /> ints <br /> B"species as described 1.Cluster of 1-5 <br /> Canada Thictl• m,� �g 'M '""`�°'�" in the Colorado Noxious <br /> Crswm atianse :,�ie� • purplel <br /> Weed Act. It is required flowers on <br /> to be either eliminated, stem. <br /> qr <br /> . � contained, or suppressed 1 2. Floral bracts <br /> depending on the local <br /> are spineless. <br /> infestations. For more flowers <br /> information visit www. 3.Small <br /> ,rthat are 1 cm in <br /> Y, peer colorado.gov/ag/weeds diameter. <br /> �y <br /> ' — and click on the Noxious4. Perennial,Weed Program link or rhizomatous <br /> call the State Weed plant <br /> ♦ r Coordinator at th spiny, oblong <br /> e <br /> green leaves. <br /> Colorado Department of <br /> Agriculture, Conservation <br /> Services Division, <br /> max..• .._.. 4, .A; (303) 869-9030. <br /> raqwnaw.er+a0 carq xrer»..-...-a+e�Av Cow+m lMfati*+.orq.,aw-ti <br />