{"id":12583,"date":"2017-12-19T14:14:22","date_gmt":"2017-12-19T19:14:22","guid":{"rendered":"https:\/\/extension.umaine.edu\/blueberries\/?page_id=12583"},"modified":"2021-01-12T11:47:01","modified_gmt":"2021-01-12T16:47:01","slug":"knapweed","status":"publish","type":"page","link":"https:\/\/extension.umaine.edu\/blueberries\/weed-images\/herbaceous-broadleaf-weeds\/bluepurple-flowers\/knapweed\/","title":{"rendered":"Knapweed"},"content":{"rendered":"<p><em>Prepared by Jennifer L. D&#8217;Appollonio, Assistant Scientist, University of Maine, Orono, ME 04469. Updated April 2019.<\/em><\/p>\n<p><strong>Scientific name:<\/strong> <em>Centaurea<\/em> L. (<em>Centaurea nigra<\/em> L. \/ <em>Centaurea jacea<\/em> L.)<em><br \/>\n<\/em><\/p>\n<p><strong>Common name(s):<\/strong> Knapweed (lesser knapweed, black knapweed \/ brown knapweed, brownray knapweed)<\/p>\n<p><strong>Links:<\/strong> <em>C. nigra<\/em> <a href=\"https:\/\/plants.usda.gov\/core\/profile?symbol=CENI2\" target=\"_blank\" rel=\"noopener noreferrer\">USDA PLANTS Profile<\/a>, <a href=\"https:\/\/gobotany.newenglandwild.org\/species\/centaurea\/nigra\/\" target=\"_blank\" rel=\"noopener noreferrer\">Go Botany<\/a>; <em>C. jacea<\/em> <a href=\"https:\/\/plants.usda.gov\/core\/profile?symbol=CEJA\" target=\"_blank\" rel=\"noopener noreferrer\">USDA PLANTS Profile<\/a>, <a href=\"https:\/\/gobotany.nativeplanttrust.org\/species\/centaurea\/jacea\/\" 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-12583 gallery-columns-4 gallery-size-thumbnail'><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\/2019\/04\/Centaurea-nigra18-001.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2019\/04\/Centaurea-nigra18-001-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"knapweed plant\" aria-describedby=\"gallery-1-16654\" srcset=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2019\/04\/Centaurea-nigra18-001-150x150.jpg 150w, https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2019\/04\/Centaurea-nigra18-001-32x32.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-1-16654'>\n\t\t\t\tmature plant in wild blueberry field\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\/2017\/12\/Centaurea-15.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2017\/12\/Centaurea-15-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Centaurea (15)\" aria-describedby=\"gallery-1-12587\" srcset=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2017\/12\/Centaurea-15-150x150.jpg 150w, https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2017\/12\/Centaurea-15-32x32.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-1-12587'>\n\t\t\t\tEarly 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\/2017\/12\/Centaurea-16.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2017\/12\/Centaurea-16-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Centaurea (16)\" srcset=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2017\/12\/Centaurea-16-150x150.jpg 150w, https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2017\/12\/Centaurea-16-32x32.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\/2017\/12\/Centaurea.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2017\/12\/Centaurea-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Centaurea-1\" aria-describedby=\"gallery-1-12584\" srcset=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2017\/12\/Centaurea-150x150.jpg 150w, https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2017\/12\/Centaurea-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-1-12584'>\n\t\t\t\tleaves may be hairy, but not spiny\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\/2019\/04\/Centaurea-nigra18-008.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2019\/04\/Centaurea-nigra18-008-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"knapweed leaf\" aria-describedby=\"gallery-1-16657\" srcset=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2019\/04\/Centaurea-nigra18-008-150x150.jpg 150w, https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2019\/04\/Centaurea-nigra18-008-32x32.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-1-16657'>\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\/2019\/04\/Centaurea-nigra18-005.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2019\/04\/Centaurea-nigra18-005-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"knapweed flowers and bracts\" aria-describedby=\"gallery-1-16655\" srcset=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2019\/04\/Centaurea-nigra18-005-150x150.jpg 150w, https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2019\/04\/Centaurea-nigra18-005-32x32.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-1-16655'>\n\t\t\t\tflowers and bracts\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\/2017\/12\/Centaurea-2.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2017\/12\/Centaurea-2-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Centaurea (2)\" aria-describedby=\"gallery-1-12585\" srcset=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2017\/12\/Centaurea-2-150x150.jpg 150w, https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2017\/12\/Centaurea-2-32x32.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-1-12585'>\n\t\t\t\tflowers are thistle-like\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\/2017\/12\/Centaurea-14.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2017\/12\/Centaurea-14-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Centaurea (14)\" srcset=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2017\/12\/Centaurea-14-150x150.jpg 150w, https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2017\/12\/Centaurea-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 landscape'>\n\t\t\t\t<a href='https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2019\/04\/Centaurea-nigra18-006.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2019\/04\/Centaurea-nigra18-006-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"knapweed flower\" srcset=\"https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2019\/04\/Centaurea-nigra18-006-150x150.jpg 150w, https:\/\/extension.umaine.edu\/blueberries\/wp-content\/uploads\/sites\/41\/2019\/04\/Centaurea-nigra18-006-32x32.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>-can grow up to 5 feet tall<\/p>\n<p>-basal leaves and stem leaves<\/p>\n<ul>\n<li>lobed\/toothed<\/li>\n<\/ul>\n<p>-black bracts<\/p>\n<p>-spreads by seeds and rhizomes<\/p>\n<p>&#8211;<em>C. nigra<\/em> and <em>C. jacea<\/em> hybridize in New England and may also be confused with each other.\u00a0 See left sidebar of Go Botany webpages, above, for more information.<\/p>\n<p><strong>Habitat:<\/strong><\/p>\n<p>-disturbed areas<\/p>\n<p>-meadows and fields<\/p>\n<p>-cultivated fields<\/p>\n<p><strong>Natural History:<\/strong><\/p>\n<p>-native to Europe and Russia<\/p>\n<p><strong>Management:<\/strong><\/p>\n<p>-hand pull and remove the entire tap root<\/p>\n<p>-mow or cut plants before flowering<\/p>\n<p>-Herbicide treatments are most effective when combines with other control techniques<\/p>\n<p>-3% solution of triclopyr herbicide mixed with water can be applied to leaves in early spring or fall<\/p>\n<p>-Gall flies are used to feed on developing seed heads.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Source(s):<\/strong><\/p>\n<p>Haines, A., Farnsworth, E., Morrison, G., &amp; New England Wild Flower Society. (2011). <i>New England Wildflower Society&#8217;s Flora Novae Angliae: A manual for the identification of native and naturalized higher vascular plants of New England<\/i>. Framingham, MA: New England Wild Flower Society. p. 387.<\/p>\n<p>Go Botany. \u201cCentaurea Nigra L.\u201d <i>Centaurea Nigra (Black Knapweed): Go Botany<\/i>, 2020, gobotany.nativeplanttrust.org\/species\/centaurea\/nigra\/.<\/p>\n<p>Michigan State Universiy. \u201cBlack Knapweed (Centaurea Nigra).\u201d <i>Midwest Invasive Species Infomation Network<\/i>, 2020, www.misin.msu.edu\/facts\/detail\/?project=misin&amp;id=295&amp;cname=Black+knapweed.<\/p>\n<div><\/div>\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 April 2019. Scientific name: Centaurea L. (Centaurea nigra L. \/ Centaurea jacea L.) Common name(s): Knapweed (lesser knapweed, black knapweed \/ brown knapweed, brownray knapweed) Links: C. nigra USDA PLANTS Profile, Go Botany; C. jacea USDA PLANTS Profile, Go Botany Images: [&hellip;]<\/p>\n","protected":false},"author":116,"featured_media":0,"parent":6020,"menu_order":20,"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-12583","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>Knapweed - 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\/knapweed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Knapweed - 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 April 2019. Scientific name: Centaurea L. (Centaurea nigra L. \/ Centaurea jacea L.) 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D&#8217;Appollonio, Assistant Scientist, University of Maine, Orono, ME 04469. Updated April 2019. Scientific name: Centaurea L. (Centaurea nigra L. \/ Centaurea jacea L.) 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