{"id":5415,"date":"2012-04-05T10:24:21","date_gmt":"2012-04-05T14:24:21","guid":{"rendered":"https:\/\/extension.umaine.edu\/blueberries\/?page_id=5415"},"modified":"2024-02-05T16:43:44","modified_gmt":"2024-02-05T21:43:44","slug":"canadian-horseweed","status":"publish","type":"page","link":"https:\/\/extension.umaine.edu\/blueberries\/weed-images\/herbaceous-broadleaf-weeds\/white-flowers\/canadian-horseweed\/","title":{"rendered":"Canadian horseweed"},"content":{"rendered":"<p><em>Prepared by Jennifer L. D&#8217;Appollonio, Assistant Scientist, University of Maine, Orono, ME 04469. Updated February 2018.<\/em><\/p>\n<p><strong>Scientific name:<\/strong> <em>Conyza canadensis <\/em>(L.) Cronquist; also <em>Erigeron canadensis<\/em> L.<em><br \/>\n<\/em><\/p>\n<p><strong>Common name(s):<\/strong> Canadian horseweed, horseweed, Canadian fleabane, Canada fleabane, coltstail, marestail, butterweed<\/p>\n<p><strong>Links:<\/strong> <a href=\"https:\/\/plants.usda.gov\/home\/plantProfile?symbol=COCA5\" target=\"_blank\" rel=\"noopener noreferrer\">USDA PLANTS Profile<\/a>, <a href=\"https:\/\/gobotany.nativeplanttrust.org\/species\/erigeron\/canadensis\/\" 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-5415 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\/Conyza-canadensis-8.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2013\/06\/Conyza-canadensis-8-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Conyza canadensis July\" aria-describedby=\"gallery-1-8896\" srcset=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2013\/06\/Conyza-canadensis-8-150x150.jpg 150w, https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2013\/06\/Conyza-canadensis-8-32x32.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-1-8896'>\n\t\t\t\tJuly\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\/2013\/06\/Conyza-canadensis-9.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2013\/06\/Conyza-canadensis-9-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Conyza canadensis pre-flower\" aria-describedby=\"gallery-1-8897\" srcset=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2013\/06\/Conyza-canadensis-9-150x150.jpg 150w, https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2013\/06\/Conyza-canadensis-9-32x32.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-1-8897'>\n\t\t\t\tpre-flower, mid-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\/2013\/06\/Conyza-canadensis-6.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2013\/06\/Conyza-canadensis-6-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Conyza canadensis early flower\" aria-describedby=\"gallery-1-8894\" srcset=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2013\/06\/Conyza-canadensis-6-150x150.jpg 150w, https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2013\/06\/Conyza-canadensis-6-32x32.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-1-8894'>\n\t\t\t\tearly flower, mid-July\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\/Conyza-canadensis-7.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2013\/06\/Conyza-canadensis-7-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Conyza canadensis flower detail\" aria-describedby=\"gallery-1-8895\" srcset=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2013\/06\/Conyza-canadensis-7-150x150.jpg 150w, https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2013\/06\/Conyza-canadensis-7-32x32.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-1-8895'>\n\t\t\t\tflower detail\n\t\t\t\t<\/dd><\/dl><br style=\"clear: both\" \/><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\/Conyza-canadensis-11.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2013\/06\/Conyza-canadensis-11-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Conyza canadensis leaf detail\" aria-describedby=\"gallery-1-8898\" srcset=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2013\/06\/Conyza-canadensis-11-150x150.jpg 150w, https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2013\/06\/Conyza-canadensis-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-1-8898'>\n\t\t\t\tleaf detail\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\/2013\/06\/Conyza-canadensis-4.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2013\/06\/Conyza-canadensis-4-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Conyza canadensis leaf underside\" aria-describedby=\"gallery-1-8893\" srcset=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2013\/06\/Conyza-canadensis-4-150x150.jpg 150w, https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2013\/06\/Conyza-canadensis-4-32x32.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-1-8893'>\n\t\t\t\tunderside of leaves\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\/Conyza-canadensis-3.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2013\/06\/Conyza-canadensis-3-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Conyza canadensis leaves\" srcset=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2013\/06\/Conyza-canadensis-3-150x150.jpg 150w, https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2013\/06\/Conyza-canadensis-3-32x32.jpg 32w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt><\/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\/Conyza-canadensis-14.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2013\/06\/Conyza-canadensis-14-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Conyza canadensis plant\" srcset=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2013\/06\/Conyza-canadensis-14-150x150.jpg 150w, https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2013\/06\/Conyza-canadensis-14-32x32.jpg 32w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt><\/dl><br style=\"clear: both\" \/><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\/Conyza-canadensis-13.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2013\/06\/Conyza-canadensis-13-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Conyza canadensis mid-August\" aria-describedby=\"gallery-1-8899\" srcset=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2013\/06\/Conyza-canadensis-13-150x150.jpg 150w, https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2013\/06\/Conyza-canadensis-13-32x32.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-1-8899'>\n\t\t\t\tmid-August\n\t\t\t\t<\/dd><\/dl>\n\t\t\t<br style='clear: both' \/>\n\t\t<\/div>\n\n<p><strong>Description:<\/strong><\/p>\n<p>-annual<\/p>\n<p>-native North American plant<\/p>\n<p>-seeds can germinate late summer &#8211; early fall or in the spring<\/p>\n<p>-produces lots of seeds<\/p>\n<p>-inhabits a wide range of growing and cultivation conditions<\/p>\n<ul>\n<li>drought and water logged conditions<\/li>\n<\/ul>\n<p><strong>Management:<\/strong><\/p>\n<p>-very herbicide resistant<\/p>\n<p>-resistant to roundup<\/p>\n<p>-can be managed by<\/p>\n<ul>\n<li>thick mulch layer<\/li>\n<li>hand pulling<\/li>\n<li>continued mowing<\/li>\n<li>post emergent herbicides<\/li>\n<\/ul>\n<p><strong>Sources:<\/strong><\/p>\n<p>Boggs, Joe, and Joe. \u201cTHE WEEKLY WEED: Canadian Horseweed (Conyza Canadensis).\u201d <i>BYGL<\/i>, 2016, bygl.osu.edu\/node\/534.<\/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. Updated February 2018. Scientific name: Conyza canadensis (L.) Cronquist; also Erigeron canadensis L. Common name(s): Canadian horseweed, horseweed, Canadian fleabane, Canada fleabane, coltstail, marestail, butterweed Links: USDA PLANTS Profile, Go Botany Images: (to see enlargements [PC]: click on image, then right click [&hellip;]<\/p>\n","protected":false},"author":218,"featured_media":0,"parent":6098,"menu_order":9,"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-5415","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>Canadian horseweed - 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\/white-flowers\/canadian-horseweed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Canadian horseweed - Cooperative Extension: Maine Wild Blueberries - University of Maine Cooperative Extension\" \/>\n<meta property=\"og:description\" content=\"Prepared by Jennifer L. D&#8217;Appollonio, Assistant Scientist, University of Maine, Orono, ME 04469. Updated February 2018. Scientific name: Conyza canadensis (L.) Cronquist; also Erigeron canadensis L. 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