{"id":4418,"date":"2026-10-04T21:13:02","date_gmt":"2026-10-04T21:13:02","guid":{"rendered":"https:\/\/www.tomat-pomidor.com\/en\/?p=4418"},"modified":"2026-10-16T20:41:09","modified_gmt":"2026-10-16T20:41:09","slug":"beating-the-97f-heatwave-roof-vents","status":"publish","type":"post","link":"https:\/\/www.tomat-pomidor.com\/en\/beating-the-97f-heatwave-roof-vents\/","title":{"rendered":"Beating the 97\u00b0F Heatwave: Roof Vents, Dropped Blossoms, and Tomato Success"},"content":{"rendered":"\n\n<div class=\"kk-star-ratings kksr-auto kksr-align-left kksr-valign-top\"\n    data-payload='{&quot;align&quot;:&quot;left&quot;,&quot;id&quot;:&quot;4418&quot;,&quot;slug&quot;:&quot;default&quot;,&quot;valign&quot;:&quot;top&quot;,&quot;ignore&quot;:&quot;&quot;,&quot;reference&quot;:&quot;auto&quot;,&quot;class&quot;:&quot;&quot;,&quot;count&quot;:&quot;0&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;0&quot;,&quot;starsonly&quot;:&quot;&quot;,&quot;best&quot;:&quot;5&quot;,&quot;gap&quot;:&quot;5&quot;,&quot;greet&quot;:&quot;Share your rating&quot;,&quot;legend&quot;:&quot;0\\\/5 - (0 votes)&quot;,&quot;size&quot;:&quot;24&quot;,&quot;title&quot;:&quot;Beating the 97\u00b0F Heatwave: Roof Vents, Dropped Blossoms, and Tomato Success&quot;,&quot;width&quot;:&quot;0&quot;,&quot;_legend&quot;:&quot;{score}\\\/{best} - ({count} {votes})&quot;,&quot;font_factor&quot;:&quot;1.25&quot;}'>\n            \n<div class=\"kksr-stars\">\n    \n<div class=\"kksr-stars-inactive\">\n            <div class=\"kksr-star\" data-star=\"1\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"2\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"3\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"4\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"5\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n    \n<div class=\"kksr-stars-active\" style=\"width: 0px;\">\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n                \n\n<div class=\"kksr-legend\" style=\"font-size: 19.2px;\">\n            <span class=\"kksr-muted\">Share your rating<\/span>\n    <\/div>\n    <\/div>\n<div class=\"tldr-box\" style=\"background: #f4f9f4; padding: 20px; border-left: 5px solid #4CAF50; margin-bottom: 30px; border-radius: 4px;\">\n<h3>\ud83d\udccc Quick Summary: Loaded Trusses, Heat and Blossom Drop in a Greenhouse<\/h3>\n<ul>\n<li>\ud83c\udf45 <strong>The Goal:<\/strong> Valeriy set out to grow several well-loaded fruit trusses on every plant. He says it worked on <em>Bulgarian Miracle<\/em>, <em>Brandywine Covlik&#8217;s Strain<\/em>, <em>Chocolate Stripes<\/em>, <em>Japonka<\/em>, <em>Coeur Fondant<\/em>, <em>Summer Sun<\/em> and <em>Dark Galaxy<\/em>, but he hasn&#8217;t figured it out for pink oxheart varieties yet.<\/li>\n<li>\ud83c\udf21\ufe0f <strong>Blossom Drop at 97\u00b0F (36\u00b0C):<\/strong> After several days of this heat, he lost blossoms on <em>Everett&#8217;s Rusty Oxheart<\/em>, <em>Oaxacan Jewel<\/em>, <em>Summer Sun<\/em> and <em>Black Krim<\/em>. He isn&#8217;t sure of the exact cause and wonders whether he underfed the plants while the fruit was swelling.<\/li>\n<li>\ud83c\udfe0 <strong>The Roof &#8220;Lantern&#8221;:<\/strong> Valeriy built a ventilation lantern (cupola) into his greenhouse roof. He says it kept the inside temperature the same as outside, and that this is the only reason his tomatoes set fruit at all.<\/li>\n<li>\ud83d\udca7 <strong>Watering and Blossom End Rot:<\/strong> He had almost no Blossom End Rot (BER) and credits watering <em>every single day<\/em> before noon, sometimes even in the midday heat. The downside: some fruit on the lower trusses cracked.<\/li>\n<li>\ud83c\udf31 <strong>His Tips:<\/strong> cooler temperatures while growing seedlings indoors, transplanting before the plants overgrow and the buds open (the ideal timing differs by variety), and balanced feeding. He says different varieties need different feeding schedules, and he plans to test a &#8220;universal&#8221; program next year.<\/li>\n<\/ul>\n<\/div>\n<div class=\"forum-post\">\n<div class=\"author-header\">\n<div class=\"forum-avatar\">V<\/div>\n<div class=\"author-meta\">\n<div class=\"author-name\">Valtwelve (Valeriy) <span class=\"author-stats\">\u2b50 Pro Grower (1,847 posts)<\/span><\/div>\n<div class=\"author-geo\">\ud83d\udccd Between Samara and Ufa (USDA Zone 4a) | \ud83d\udcc5 July 17, 2021<\/div>\n<\/div>\n<\/div>\n<div class=\"post-content\">\n<p>I learned a lot of new things about tomatoes this year, and I feel like I&#8217;m finally starting to understand them. Some of my &#8220;wishlist&#8221; goals are actually coming true! The main goal was to grow multiple high-quality, fully loaded fruit trusses on each plant.<\/p>\n<p>It worked perfectly on <em>Bulgarian Miracle (Bolgarskoye Chudo)<\/em> (there are more loaded trusses higher up that didn&#8217;t fit in the photo), <em>Brandywine Covlik&#8217;s Strain<\/em>, <em>Chocolate Stripes<\/em>, <em>Japonka (<a href=\"https:\/\/www.tomat-pomidor.com\/en\/japanese\/\">Japanese Girl<\/a>)<\/em>, <em>Coeur Fondant<\/em>, <a href=\"https:\/\/www.tomat-pomidor.com\/en\/summer-sun-f1\/\"><em>Summer Sun<\/em><\/a>, and <em>Dark Galaxy<\/em>.<br \/>\nI haven&#8217;t quite figured out how to achieve this with the pink oxheart varieties yet, but I have a plan of attack for them&#8230; I&#8217;m already looking forward to next year, as this tomato season feels like a wrap for me!<\/p>\n<div class=\"forum-images\" style=\"margin-top: 15px;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto; border-radius: 8px; margin-bottom: 10px; display: inline-block; width: 48%;\" src=\"https:\/\/www.tomat-pomidor.com\/uploads\/monthly_2021_07\/1877059206_14_07.jpg.1a46794da03fbc0f7abbdbc505986a29.jpg\" alt=\"Tomato truss in Valeriy's greenhouse, photo 1\" \/><br \/>\n<img decoding=\"async\" style=\"max-width: 100%; height: auto; border-radius: 8px; margin-bottom: 10px; display: inline-block; width: 48%; margin-left: 2%;\" src=\"https:\/\/www.tomat-pomidor.com\/uploads\/monthly_2021_07\/1806383941_14_07.jpg.a62c6effbce14001878510cdab0867a1.jpg\" alt=\"Tomato truss in Valeriy's greenhouse, photo 2\" \/><br \/>\n<img decoding=\"async\" style=\"max-width: 100%; height: auto; border-radius: 8px; margin-bottom: 10px; display: inline-block; width: 48%;\" src=\"https:\/\/www.tomat-pomidor.com\/uploads\/monthly_2021_07\/659565271_14_07.jpg.d778068a940c2a7a4098dca5fa6c8c99.jpg\" alt=\"Tomato truss in Valeriy's greenhouse, photo 3\" \/><br \/>\n<img decoding=\"async\" style=\"max-width: 100%; height: auto; border-radius: 8px; margin-bottom: 10px; display: inline-block; width: 48%; margin-left: 2%;\" src=\"https:\/\/www.tomat-pomidor.com\/uploads\/monthly_2021_07\/80369557_14_07.jpg.8a5e01e2d29b03e4492a0c5651530cc4.jpg\" alt=\"Tomato truss in Valeriy's greenhouse, photo 4\" \/><br \/>\n<img decoding=\"async\" style=\"max-width: 100%; height: auto; border-radius: 8px; margin-bottom: 10px; display: inline-block; width: 48%;\" src=\"https:\/\/www.tomat-pomidor.com\/uploads\/monthly_2021_07\/1124658901_14_07.jpg.14ce823cc7d5ec554f9cdfaa59005d91.jpg\" alt=\"Tomato truss in Valeriy's greenhouse, photo 5\" \/><br \/>\n<img decoding=\"async\" style=\"max-width: 100%; height: auto; border-radius: 8px; margin-bottom: 10px; display: inline-block; width: 48%; margin-left: 2%;\" src=\"https:\/\/www.tomat-pomidor.com\/uploads\/monthly_2021_07\/451294240_14_07.jpg.dc68650515d4e1febce7996237561155.jpg\" alt=\"Tomato truss in Valeriy's greenhouse, photo 6\" \/><br \/>\n<img decoding=\"async\" style=\"max-width: 100%; height: auto; border-radius: 8px; margin-bottom: 10px; display: block;\" src=\"https:\/\/www.tomat-pomidor.com\/uploads\/monthly_2021_07\/712639699_14_07.jpg.f32e6404c912a8f4259c8bd319f61ce5.jpg\" alt=\"Greenhouse aisle with ripening tomatoes, photo 7\" \/><\/div>\n<\/div>\n<\/div>\n<div class=\"forum-post\">\n<div class=\"author-header\">\n<div class=\"forum-avatar\">R<\/div>\n<div class=\"author-meta\">\n<div class=\"author-name\">Raduga (Galina) <span class=\"author-stats\">\u2b50 VIP User (6,149 posts)<\/span><\/div>\n<div class=\"author-geo\">\ud83d\udccd St. Petersburg (USDA Zone 5a) | \ud83d\udcc5 July 17, 2021<\/div>\n<\/div>\n<\/div>\n<div class=\"post-content\">\n<blockquote><p><strong>Valtwelve wrote:<\/strong><br \/>\nThe main goal was to grow multiple high-quality, fully loaded fruit trusses on each plant.<\/p><\/blockquote>\n<p>Bravo, Valeriy! \ud83c\udfa9 It is so joyful reading posts like this! \ud83d\ude0d<br \/>\nThis has been a very unusual season. Valeriy, did you experience any blossom drop because of the high temperatures? And did you manage to avoid Blossom End Rot (BER)? \u2709\ufe0f Please share your secrets!<\/p>\n<\/div>\n<\/div>\n<div class=\"forum-post\">\n<div class=\"author-header\">\n<div class=\"forum-avatar\">V<\/div>\n<div class=\"author-meta\">\n<div class=\"author-name\">Valtwelve (Valeriy) <span class=\"author-stats\">\u2b50 Pro Grower (1,847 posts)<\/span><\/div>\n<div class=\"author-geo\">\ud83d\udccd Between Samara and Ufa (USDA Zone 4a) | \ud83d\udcc5 July 17, 2021<\/div>\n<\/div>\n<\/div>\n<div class=\"post-content\">\n<blockquote><p><strong>Raduga wrote:<\/strong><br \/>\n&#8230;did you experience any blossom drop because of the high temperatures? And did you manage to avoid Blossom End Rot&#8230;<\/p><\/blockquote>\n<p>I can&#8217;t say exactly what caused it, but yes, I did have some blossom drop. After all, we had multiple days where the temperature hit 97\u00b0F (36\u00b0C). I have a custom ventilation &#8220;lantern&#8221; (cupola) built into the roof of my greenhouse, which kept the inside temperature identical to the outside air &#8211; and that is the only reason my tomatoes managed to set fruit at all &#8211; but 97\u00b0F is still just too hot.<\/p>\n<p>I lost blossoms on varieties like <em>Everett&#8217;s Rusty Oxheart<\/em>, <em>Oaxacan Jewel<\/em>, <em>Summer Sun<\/em>, and <a href=\"https:\/\/www.tomat-pomidor.com\/en\/black-krim\/\"><em>Black Krim<\/em><\/a>. Again, I don&#8217;t know the exact reason, maybe I underfed them right when the fruit was swelling. Like I said, I&#8217;m just starting to figure them out. Next year I will try to eliminate nutrient deficiency as a potential cause for blossom drop.<\/p>\n<p><strong>As for Blossom End Rot:<\/strong> I had almost none! Like I mentioned before, it only showed up on 4 tomatoes grown outside in the open ground because I skipped watering them during a cold snap. Right now, I have BER on exactly one <em>Donkey Ears<\/em> tomato and a couple of specks on two <em>Coeur Fondant<\/em> tomatoes.<br \/>\nI credit the lack of BER in this extreme heat entirely to the fact that I water <em>every single day<\/em> before noon, and sometimes I even water right in the middle of the blazing heat.<br \/>\nBecause of this heavy watering, some of the tomatoes on the lower trusses cracked (especially the delicate ones like <a href=\"https:\/\/www.tomat-pomidor.com\/en\/brandywine-covliks\/\"><em>Brandywine Covlik&#8217;s Strain<\/em><\/a>, <em>Oaxacan Jewel<\/em>, and my favorite <em>Everett&#8217;s Rusty Oxheart<\/em>). I overdid it a bit, but you can&#8217;t please everyone! And the heat just keeps going&#8230; it&#8217;s the third month of this!!! We&#8217;ve never had a summer like this before!<\/p>\n<p>Here is my roof ventilation lantern:<\/p>\n<div class=\"forum-images\" style=\"margin-top: 15px;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto; border-radius: 8px; margin-bottom: 10px; display: block;\" src=\"https:\/\/www.tomat-pomidor.com\/uploads\/monthly_2021_07\/1639010681_.jpg.563ae1980699a528bbeeaea6d89f427d.jpg\" alt=\"Valeriy's greenhouse with a ventilation lantern on the roof\" \/><\/div>\n<\/div>\n<\/div>\n<div class=\"forum-post\">\n<div class=\"author-header\">\n<div class=\"forum-avatar\">T<\/div>\n<div class=\"author-meta\">\n<div class=\"author-name\">Tatunya (Tanya) <span class=\"author-stats\">\u2b50 Legend (13,829 posts)<\/span><\/div>\n<div class=\"author-geo\">\ud83d\udccd Istra, Moscow Reg. (USDA Zone 4b) | \ud83d\udcc5 July 17, 2021<\/div>\n<\/div>\n<\/div>\n<div class=\"post-content\">\n<blockquote><p><strong>Valtwelve wrote:<\/strong><br \/>\nThe main goal was to grow multiple high-quality, fully loaded fruit trusses on each plant.<\/p><\/blockquote>\n<p>What exactly did you learn? What is required to get so many high-quality trusses?<\/p>\n<\/div>\n<\/div>\n<div class=\"forum-post\">\n<div class=\"author-header\">\n<div class=\"forum-avatar\">V<\/div>\n<div class=\"author-meta\">\n<div class=\"author-name\">Valtwelve (Valeriy) <span class=\"author-stats\">\u2b50 Pro Grower (1,847 posts)<\/span><\/div>\n<div class=\"author-geo\">\ud83d\udccd Between Samara and Ufa (USDA Zone 4a) | \ud83d\udcc5 July 17, 2021<\/div>\n<\/div>\n<\/div>\n<div class=\"post-content\">\n<blockquote><p><strong>Tatunya wrote:<\/strong><br \/>\nWhat is required to get so many high-quality trusses?<\/p><\/blockquote>\n<p>A lot of things are required. I wrote about some of it above.<br \/>\nYou need cooler temperatures while growing the seedlings indoors, so you get strong, sturdy transplants. You need to transplant them into the greenhouse <em>before<\/em> they overgrow and their buds open. For one variety, the perfect time to plant is when the very first bud appears. For another, it&#8217;s right before the bud appears. For a third, it&#8217;s when the bud has been visible for 3 to 5 days.<br \/>\nYou also have to feed them a properly balanced diet. And it turns out, different varieties require completely different feeding schedules! Right now, I&#8217;m trying to figure out a &#8220;universal&#8221; feeding program that works reasonably well for all of them, but I don&#8217;t know if it will work yet. I&#8217;ll test it out next year. Anyway, I shouldn&#8217;t ramble about all this in someone else&#8217;s diary&#8230;<\/p>\n<\/div>\n<\/div>\n<div id=\"editor-note\" class=\"editor-note\" style=\"background: #eef7ff; padding: 20px; border-left: 5px solid #2196F3; margin-top: 25px; font-size: 1.05em; line-height: 1.6; border-radius: 0 4px 4px 0;\">\n<h4 style=\"margin-top: 0; color: #1565c0;\">\ud83d\udcdd Translator&#8217;s Notes: A Few Terms from This Thread<\/h4>\n<ul>\n<li><strong>Lantern (cupola):<\/strong> a raised vent structure built into the roof of a greenhouse. &#8220;Lantern&#8221; is the word Valeriy uses for it, and he shows his own in the photo above.<\/li>\n<li><strong>Truss:<\/strong> a cluster of tomatoes growing on one stem. &#8220;Loaded trusses&#8221; means clusters with plenty of fruit.<\/li>\n<li><strong>Blossom drop:<\/strong> flowers falling off the plant without setting fruit.<\/li>\n<li><strong>BER (Blossom End Rot):<\/strong> a dark, sunken patch that appears on the bottom end of a tomato. Valeriy credits daily watering for avoiding it, which is his own experience.<\/li>\n<\/ul>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\ud83d\udccc Quick Summary: Loaded Trusses, Heat and Blossom Drop in a Greenhouse \ud83c\udf45 The Goal: Valeriy set out to grow several well-loaded fruit trusses on every plant. He says it worked on Bulgarian Miracle, Brandywine Covlik&#8217;s Strain, Chocolate Stripes, Japonka, Coeur Fondant, Summer Sun and Dark Galaxy, but he hasn&#8217;t figured it out for pink &#8230; <a title=\"Beating the 97\u00b0F Heatwave: Roof Vents, Dropped Blossoms, and Tomato Success\" class=\"read-more\" href=\"https:\/\/www.tomat-pomidor.com\/en\/beating-the-97f-heatwave-roof-vents\/\" aria-label=\"Read more about Beating the 97\u00b0F Heatwave: Roof Vents, Dropped Blossoms, and Tomato Success\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":4418,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[806,529],"tags":[1119,1121,1122,1120],"class_list":["post-4418","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-grower-diaries","category-growing-tomatoes","tag-greenhouse-ventilation","tag-preventing-blossom-end-rot","tag-russian-tomato-varieties","tag-tomato-blossom-drop"],"_links":{"self":[{"href":"https:\/\/www.tomat-pomidor.com\/en\/wp-json\/wp\/v2\/posts\/4418","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.tomat-pomidor.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.tomat-pomidor.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.tomat-pomidor.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tomat-pomidor.com\/en\/wp-json\/wp\/v2\/comments?post=4418"}],"version-history":[{"count":4,"href":"https:\/\/www.tomat-pomidor.com\/en\/wp-json\/wp\/v2\/posts\/4418\/revisions"}],"predecessor-version":[{"id":5651,"href":"https:\/\/www.tomat-pomidor.com\/en\/wp-json\/wp\/v2\/posts\/4418\/revisions\/5651"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.tomat-pomidor.com\/en\/wp-json\/wp\/v2\/posts\/4418"}],"wp:attachment":[{"href":"https:\/\/www.tomat-pomidor.com\/en\/wp-json\/wp\/v2\/media?parent=4418"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.tomat-pomidor.com\/en\/wp-json\/wp\/v2\/categories?post=4418"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.tomat-pomidor.com\/en\/wp-json\/wp\/v2\/tags?post=4418"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}