{"id":2045,"date":"2013-12-19T09:22:00","date_gmt":"2013-12-19T09:22:00","guid":{"rendered":"http:\/\/bostonzest.com\/?p=2045"},"modified":"2013-12-19T09:22:00","modified_gmt":"2013-12-19T09:22:00","slug":"how-cold-is-cold-enough-to-curl-a-rhododendron","status":"publish","type":"post","link":"http:\/\/bostonzest.com\/?p=2045","title":{"rendered":"How Cold Is Cold Enough to Curl a Rhododendron?"},"content":{"rendered":"<p><span style=\"text-decoration: underline;\"> <a class=\"asset-img-link\" href=\"http:\/\/bostonzest.typepad.com\/.a\/6a00e54fc42bb8883401a3fa9d2434970b-popup\" onclick=\"window.open( this.href, &#39;_blank&#39;, &#39;width=640,height=480,scrollbars=no,resizable=no,toolbar=no,directories=no,location=no,menubar=no,status=no,left=0,top=0&#39; ); return false\" style=\"display: inline;\"><img decoding=\"async\" alt=\"-tell-temperature-by-Rhododendron-leaf-curl-\" class=\"asset asset-image at-xid-6a00e54fc42bb8883401a3fa9d2434970b\" src=\"https:\/\/bostonzest.typepad.com\/.a\/6a00e54fc42bb8883401a3fa9d2434970b-400wi\" style=\"width: 400px;\" title=\"-tell-temperature-by-Rhododendron-leaf-curl-\" \/><\/a><\/p>\n<p> <\/span>How cold has it been in Boston lately? Cold enough for the rhododendron leaves to begin to curl. And, cold enough for some of our readers to dig out a post from 2008 to learn about it. So, here&#39;s a bit of that readers&#39; choice for those of you who have discovered BostonZest, in more recent times.<\/p>\n<p><strong>Rhododendrons can be used as a natural thermometer,<\/strong> if you learn the signals their leaves are giving you.<\/p>\n<p>This photo (above) was taken mid-winter as the leaves were beginning to tighten into their most protective roll.<\/p>\n<p>Garth Wedemire over at <a href=\"http:\/\/www.rhododendron.org\/\" target=\"_self\">The Amercian Rhododendron Society<\/a>&#0160;says, &quot;Leaves of rhododendrons respond to cold by first drooping&#8230;then curling up.<\/p>\n<ul>\n<li>At temperatures above freezing, the leaves extend at approximately right angles from the stems.<\/li>\n<li>Just below freezing, the leaves droop downwards&#8230;but remain flattened.<\/li>\n<\/ul>\n<p>At 25\u00b0 or thereabouts&#8230;the leaves droop and curl, and by 20\u00b0, they are curled so tightly that they look like green pencils. Once the temperature drops below 20\u00b0, they can&#39;t curl up much tighter, and only a non-living thermometer will do.&quot;<\/p>\n<p><a href=\"http:\/\/www.rhododendron.org\/news\/plantsv10n3.htm\" target=\"_self\">Here&#39;s the page with Garth Wedemire&#39;s article.<\/a><\/p>\n<p><a class=\"asset-img-link\" href=\"http:\/\/bostonzest.typepad.com\/.a\/6a00e54fc42bb88834019b032b5310970c-popup\" onclick=\"window.open( this.href, &#39;_blank&#39;, &#39;width=640,height=480,scrollbars=no,resizable=no,toolbar=no,directories=no,location=no,menubar=no,status=no,left=0,top=0&#39; ); return false\" style=\"display: inline;\"><img decoding=\"async\" alt=\"- curled-rhodendrum-leaves-20-degrees-\" class=\"asset asset-image at-xid-6a00e54fc42bb88834019b032b5310970c\" src=\"https:\/\/bostonzest.typepad.com\/.a\/6a00e54fc42bb88834019b032b5310970c-400wi\" style=\"width: 400px;\" title=\"- curled-rhodendrum-leaves-20-degrees-\" \/><\/a><\/p>\n<p>Here&#39;s what the leaves look like when it is under 20 degrees.<\/p>\n<p>He says this is a defensive reaction designed to prevent moisture loss from the leaves. These plants will show some drooping and curling in extreme heat as well.<\/p>\n<p>&#0160;<\/p>\n<p><span style=\"color: #888888;\"><em>Do you have an Amazon Gift Certificate to use? Or do you need to buy one for a holiday gift? Remember <a href=\"http:\/\/www.amazon.com\/?_encoding=UTF8&amp;tag=bostonzestcom-20&amp;linkCode=ur2&amp;camp=1789&amp;creative=390957\" target=\"_blank\">to click over to Amazon<\/a><img loading=\"lazy\" decoding=\"async\" alt=\"\" border=\"0\" height=\"1\" src=\"https:\/\/www.assoc-amazon.com\/e\/ir?t=bostonzestcom-20&amp;l=ur2&amp;o=1\" style=\"border: none !important; margin: 0px !important;\" width=\"1\" \/> from here to support this site!<\/em><\/span><\/p>\n<p><iframe loading=\"lazy\" border=\"0\" frameborder=\"0\" height=\"90\" marginwidth=\"0\" scrolling=\"no\" src=\"http:\/\/rcm-na.amazon-adsystem.com\/e\/cm?t=bostonzestcom-20&amp;o=1&amp;p=20&amp;l=ur1&amp;category=gift_certificates&amp;banner=05F47J9V4TS95DY2CR82&amp;f=ifr\" style=\"border: none;\" width=\"120\"><\/iframe><\/p>\n<p><strong>Details:<\/strong><\/p>\n<p>Words: Penny Cherubino<br \/>Photography: \u00a9 2008 and \u00a9 2013 Penny Cherubino&#0160;&#0160; <\/p>\n<p><span style=\"color: #888888;\"><em>Note on Comments: We monitor comments constantly and anything that is pure spam, inappropriate, or nasty is swept away. In addition to readers&#39; comments, we welcome hearing from the people, places, and services we cover. Often, those add great insights for our readers. As long as it doesn\u2019t become a pure ad, we\u2019d love to hear from you. We do reserve the right to edit ads and links out of comments.<\/em><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Rhododendrons can be used as a natural thermometer!<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[278,964,1372],"tags":[13761,13762,7982,13763,13760,13759,13764],"class_list":["post-2045","post","type-post","status-publish","format-standard","hentry","category-boston101","category-city-life","category-nature","tag-boston-gardens","tag-cold","tag-freezing","tag-gardening-books","tag-rhododendron","tag-rhododendron-as-thermometer","tag-small-space-gardening"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How Cold Is Cold Enough to Curl a Rhododendron? - bostonzest<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/bostonzest.com\/?p=2045\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How Cold Is Cold Enough to Curl a Rhododendron? 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