{"id":5410,"date":"2012-02-15T15:24:39","date_gmt":"2012-02-15T20:24:39","guid":{"rendered":"https:\/\/extension.umaine.edu\/blueberries\/?page_id=5410"},"modified":"2024-02-05T15:15:50","modified_gmt":"2024-02-05T20:15:50","slug":"canada-thistle","status":"publish","type":"page","link":"https:\/\/extension.umaine.edu\/blueberries\/weed-images\/herbaceous-broadleaf-weeds\/bluepurple-flowers\/canada-thistle\/","title":{"rendered":"Canada thistle"},"content":{"rendered":"<p><em>Prepared by Jennifer L. D&#8217;Appollonio, Assistant Scientist, University of Maine, Orono, ME 04469. September 2011.<\/em><\/p>\n<p><strong>Scientific name:<\/strong> <em>Cirsium arvense <\/em>(L.) Scop.<em><br \/>\n<\/em><\/p>\n<p><strong>Common name(s):<\/strong> Canada thistle, Canadian thistle, creeping thistle, cursed thistle<\/p>\n<p><strong>Links:<\/strong> <a href=\"https:\/\/plants.usda.gov\/home\/plantProfile?symbol=CIAR4\" target=\"_blank\" rel=\"noopener noreferrer\">USDA PLANTS Profile<\/a>, <a href=\"https:\/\/gobotany.nativeplanttrust.org\/species\/cirsium\/arvense\/\" target=\"_blank\" rel=\"noopener noreferrer\">Go Botany<\/a><\/p>\n<p><em><strong>Images:<\/strong> (to see enlargements [PC]: click on image, then right click and choose &#8220;view image&#8221;)<\/em><\/p>\n\n\t\t<style type=\"text\/css\">\n\t\t\t#gallery-1 {\n\t\t\t\tmargin: auto;\n\t\t\t}\n\t\t\t#gallery-1 .gallery-item {\n\t\t\t\tfloat: left;\n\t\t\t\tmargin-top: 10px;\n\t\t\t\ttext-align: center;\n\t\t\t\twidth: 25%;\n\t\t\t}\n\t\t\t#gallery-1 img {\n\t\t\t\tborder: 2px solid #cfcfcf;\n\t\t\t}\n\t\t\t#gallery-1 .gallery-caption {\n\t\t\t\tmargin-left: 0;\n\t\t\t}\n\t\t\t\/* see gallery_shortcode() in wp-includes\/media.php *\/\n\t\t<\/style>\n\t\t<div id='gallery-1' class='gallery galleryid-5410 gallery-columns-4 gallery-size-thumbnail'><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon portrait'>\n\t\t\t\t<a href='https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2013\/06\/Cirsium-arvense-1.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2013\/06\/Cirsium-arvense-1-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Cirsium arvense in flower\" aria-describedby=\"gallery-1-8889\" srcset=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2013\/06\/Cirsium-arvense-1-150x150.jpg 150w, https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2013\/06\/Cirsium-arvense-1-32x32.jpg 32w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-8889'>\n\t\t\t\tin flower, late July\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon portrait'>\n\t\t\t\t<a href='https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2014\/02\/Cirsium-arvense-11.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2014\/02\/Cirsium-arvense-11-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Cirsium arvense leaves\" aria-describedby=\"gallery-1-9345\" srcset=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2014\/02\/Cirsium-arvense-11-150x150.jpg 150w, https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2014\/02\/Cirsium-arvense-11-32x32.jpg 32w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-9345'>\n\t\t\t\tleaves\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2013\/06\/Cirsium-arvense-2.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2013\/06\/Cirsium-arvense-2-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Cirsium arvense flower\" srcset=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2013\/06\/Cirsium-arvense-2-150x150.jpg 150w, https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2013\/06\/Cirsium-arvense-2-32x32.jpg 32w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt><\/dl>\n\t\t\t<br style='clear: both' \/>\n\t\t<\/div>\n\n<p><strong>Description:<\/strong><\/p>\n<p>-perennial<\/p>\n<p>-leaves are alternate on the stem<\/p>\n<ul>\n<li>spiny and lobed<\/li>\n<\/ul>\n<p>-generally flowers July through August in ME<\/p>\n<p><strong>Habitat:<\/strong><\/p>\n<p>-disturbed areas<\/p>\n<p>-meadows<\/p>\n<p>-fields<\/p>\n<p><strong>Natural History:<\/strong><\/p>\n<p>-native to Europe<\/p>\n<ul>\n<li>introduction due to farm seed shipments<\/li>\n<\/ul>\n<p><strong>Agriculture:<\/strong><\/p>\n<p>-crowds native species<\/p>\n<p>-reduces crop and forage yields<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Source(s):<\/strong><\/p>\n<p>Heinrich, B. 1976. Flowering phenologies: Bog, woodland, and disturbed habitats. <em>Ecology<\/em>. 57(5):890-899.<\/p>\n<p>National Invasive Species Information Center. \u201cCanada Thistle.\u201d <i>Terrestrial Plants<\/i>, USDA, 2020, www.invasivespeciesinfo.gov\/terrestrial\/plants\/canada-thistle.<\/p>\n<div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Prepared by Jennifer L. D&#8217;Appollonio, Assistant Scientist, University of Maine, Orono, ME 04469. September 2011. Scientific name: Cirsium arvense (L.) Scop. Common name(s): Canada thistle, Canadian thistle, creeping thistle, cursed thistle Links: USDA PLANTS Profile, Go Botany Images: (to see enlargements [PC]: click on image, then right click and choose &#8220;view image&#8221;) Description: -perennial -leaves [&hellip;]<\/p>\n","protected":false},"author":218,"featured_media":0,"parent":6020,"menu_order":4,"comment_status":"closed","ping_status":"closed","template":"templates\/page-withsidebar.php","meta":{"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-5410","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Canada thistle - Cooperative Extension: Maine Wild Blueberries - University of Maine Cooperative Extension<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/extension.umaine.edu\/blueberries\/weed-images\/herbaceous-broadleaf-weeds\/bluepurple-flowers\/canada-thistle\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Canada thistle - Cooperative Extension: Maine Wild Blueberries - University of Maine Cooperative Extension\" \/>\n<meta property=\"og:description\" content=\"Prepared by Jennifer L. 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