It usually is a problem in disturbed areas and . Noxious Weed Program. It was likely one of the first weeds introduced by North American settlers in the 1600s as a contaminant in seeds. Minnesota has many varieties of thistle species, some are native and others are invasive. Canada thistle is an invasive species. Description. Leaf shape varies across different varieties and subspecies. Hadroplontus litura Hadroplontus litura, or the Canada thistle stem weevil, is a biological control agent that attacks Canada thistle by larval feeding within the stem, opening the plant up for secondary damage from other organisms such as opportunistic pathogens. A species profile for Canada Thistle. The Minnesota Department of Natural Resources provides detailed recommendations for reporting invasive species. It is shade intolerant and therefore is rarely found within wooded sites, except in clearings. Early Detection and Rapid Response (EDRR) is a concept to identify potentially invasive species prior to or just as the establishment of the invasive is taking place. Female flowers are fragrant, male flowers are not. Prevention is the best and cheapest management option. Many insects feed on the leaves, stems, flowers and seeds, while some songbirds also feed on thistle seeds. Seeds survive in the soil for over 20 years. Canada Thistle (Cirsium arvense) Herbaceous perennial, 2-6.5’ tall with upright, grooved stems that branch near the top of the plant. MT-5 September 2006 Ecology and Management of Canada thistle [Cirsium arvense (L.) Scop.] USDA. University of Alaska - Anchorage. micranthos (invasive) – does not have spines on leaves while Canada thistle does. It grows in circular patches, spreading vegetatively. University of Nebraska - Lincoln. Height to 4 ft. Foliage irregularly and sharply lobed; margins with short spines. GRIN-Global. National Invasive Species Information Center, Early Detection & Distribution Mapping System (EDDMapS) - Canada Thistle, Pest Tracker - Survey Status of Canada Thistle, Factsheet - Canada Thistle (Mar 2019) (PDF | 2.03 MB), Fact Sheet: Canada Thistle (Jan 2014) (PDF | 481 KB), Invasive Plants of California's Wildlands -, Invasive Plants of California's Wildlands, Invasive Plants of Ohio: Fact Sheet 14 - Canada Thistle (PDF | 214 KB), Alaska Exotic Plants Information Clearinghouse (AKEPIC): Species Biography - Canada Thistle (Feb 7, 2011) (PDF | 142 KB). Canada thistle also has relatively small flowers. Canada Thistle; Canada Thistle . Growth habit: Deep-rooted and colony-forming perennial. However, it is an invasive exotic weed that competes fiercely with native plants, and its presence degrades the native ecosystems it infests. The University of Minnesota is an equal opportunity educator and employer. Grazing strategies can affect thistle prevalence. Before sharing sensitive information online, make sure you’re on a .gov or .mil site by inspecting your browser’s address (or “location”) bar. It is a non-native invasive species from Europe, and landowners with Canada thistle on their property are obligated to take measures to control it. Tiny (a tenth of an inch) light brown, slightly tapered seeds are tufted for dispersal by the wind. It is believed to have come from the eastern Mediterranean region and was likely one of the first weeds that early settlers imported to North America. Pennsylvania Department of Conservation and Natural Resources. Canada thistle is found across most of North America. Cirsium arvense is a perennial species of flowering plant in the family Asteraceae, native throughout Europe and western Asia, northern Africa and widely introduced elsewhere. Invasive Species, 2270 Old Penitentiary Road, Boise, ID, 83712, United States The stems are hairy. Aquatic invasive species detector program. PPQ. Ohio State University. Minnesota has many varieties of thistle species, some are native and others are invasive. See also: Best Control Practice Guides for more guides. Each small section of root can form a new plant. Canada thistle is found in any type of habitat but normally establishes quickly in disturbed areas. for more information about individual invasive species, including those listed as "Prohibited Noxious" and "Noxious" under the Alberta Weed Control Act Factsheet - Canada Thistle (Mar 2019) (PDF | 2.03 MB) Invasive Species Council of British Columbia (Canada). All rights reserved. University of Minnesota Extension discovers science-based solutions, delivers practical education, and engages Minnesotans to build a better future. Canada thistle can grow up to two metres tall at maturity. Crowds out native species (Stachion and Zimdahl 1980); reduces crop and forage yields (Moore 1975) Invasive Species → Canada Thistle Canada Thistle. 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