{"id":4086,"date":"2026-09-30T18:39:01","date_gmt":"2026-09-30T18:39:01","guid":{"rendered":"https:\/\/www.tomat-pomidor.com\/en\/?p=4086"},"modified":"2026-09-30T18:42:04","modified_gmt":"2026-09-30T18:42:04","slug":"why-broccoli-plants-not-forming-heads-in-summer","status":"publish","type":"post","link":"https:\/\/www.tomat-pomidor.com\/en\/why-broccoli-plants-not-forming-heads-in-summer\/","title":{"rendered":"Why Are Broccoli Plants Growing Huge Leaves but Not Forming Heads in the Summer Heat? (7-Step Checklist)"},"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;4086&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;Rate this&quot;,&quot;legend&quot;:&quot;0\\\/5 - (0 votes)&quot;,&quot;size&quot;:&quot;24&quot;,&quot;title&quot;:&quot;Why Are Broccoli Plants Growing Huge Leaves but Not Forming Heads in the Summer Heat? (7-Step Checklist)&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\">Rate this<\/span>\n    <\/div>\n    <\/div>\n<p><script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"QAPage\",\n  \"mainEntity\": {\n    \"@type\": \"Question\",\n    \"name\": \"Why is my broccoli growing massive leaves but not forming heads?\",\n    \"text\": \"My broccoli plants have grown into huge bushes, but they aren't forming any central heads. I fed them properly and watered them, but the weather was unusually hot in May. What went wrong, and what should I do now?\",\n    \"answerCount\": 1,\n    \"datePublished\": \"2021-06-30T22:30:00+03:00\",\n    \"author\": {\n      \"@type\": \"Person\",\n      \"name\": \"Tatka\",\n      \"url\": \"https:\/\/www.tomat-pomidor.com\/profile\/62369-%D1%82%D1%82%D0%BA\/\"\n    },\n    \"acceptedAnswer\": {\n      \"@type\": \"Answer\",\n      \"text\": \"To get broccoli to form a head, you need heat-tolerant pro seeds, and the seedlings must be grown in individual plugs (not community flats) to avoid root shock. You need to heavily feed them for the first 6 weeks to grow a massive plant (20 inches tall and wide). If you did all this and still have no heads, the extreme heat caused it. Cut off the central growing point to force the plant to push out side shoots.\",\n      \"datePublished\": \"2021-07-01T09:55:00+03:00\",\n      \"url\": \"https:\/\/www.tomat-pomidor.com\/en\/why-broccoli-plants-not-forming-heads-in-summer\/#answer\",\n      \"author\": {\n        \"@type\": \"Person\",\n        \"name\": \"Aleksan9ra\",\n        \"url\": \"https:\/\/www.tomat-pomidor.com\/profile\/56700-aleksan9ra\/\"\n      },\n      \"upvoteCount\": 45\n    }\n  }\n}\n<\/script><\/p>\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: &#8220;All Leaves, No Crown&#8221;<\/h3>\n<ul>\n<li>\ud83c\udf21\ufe0f <strong>The Heat Factor:<\/strong> Broccoli is notorious for refusing to head up during sudden heatwaves. If your region had a scorching late spring, the plants often stall. Heads usually start forming once the rains and cooler weather roll in.<\/li>\n<li>\ud83c\udf31 <strong>Root Shock:<\/strong> Starting broccoli seeds in a community flat and tearing the roots at transplant is a classic mistake. Always use individual seed-starter cells.<\/li>\n<li>\u2702\ufe0f <strong>The Emergency Fix:<\/strong> If your plant is a giant bush with absolutely no central bud forming, chop the top center off! This breaks apical dominance and forces the plant to shoot out multiple smaller side florets.<\/li>\n<\/ul>\n<\/div>\n<div class=\"forum-post\">\n<div class=\"author-header\">\n<div class=\"forum-avatar\">G<\/div>\n<div class=\"author-meta\">\n<div class=\"author-name\">gala7496 (Galina) <span class=\"author-stats\">\u2b50 Pro Grower (2,462 posts)<\/span><\/div>\n<div class=\"author-geo\">\ud83d\udccd Unknown Region | \ud83d\udcc5 June 30, 2021<\/div>\n<\/div>\n<\/div>\n<div class=\"post-content\">\n<p>Good evening, everyone!<\/p>\n<p>I\u2019m having an issue-my broccoli just isn&#8217;t forming heads. I was so happy with my crop last year, so I\u2019m a bit bummed out this time around.<\/p>\n<p>On another note, I planted pumpkins and labeled everything perfectly, but half of them grew into zucchini and the other half into pumpkins! The seeds were from Brizhan.<br \/>\nMy potatoes grown from seed are looking great, though I haven&#8217;t dug them up to taste yet. I also planted a ton of garlic this year, various varieties, including a &#8220;village&#8221; heirloom-that one was the very first to send up scapes.<\/p>\n<p>Evening photo: My rose bush.<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.tomat-pomidor.com\/uploads\/monthly_2021_06\/20210630_201001.jpg.925658c1acffd64700c480d6448f77fa.jpg\" \/>T<\/p>\n<\/div>\n<\/div>\n<div class=\"forum-post\">\n<div class=\"author-header\">\n<div class=\"author-meta\">\n<div class=\"author-name\">Tatka (Tatiana) <span class=\"author-stats\">\u2b50 VIP User (34,939 posts)<\/span><\/div>\n<div class=\"author-geo\">\ud83d\udccd Kazan, Tatarstan (USDA Zone 4a) | \ud83d\udcc5 July 1, 2021<\/div>\n<\/div>\n<\/div>\n<div class=\"post-content\">\n<blockquote><p><strong>gala7496 wrote:<\/strong><br \/>\nmy broccoli just isn&#8217;t forming heads.<\/p><\/blockquote>\n<p>Same here!<\/p>\n<p>I\u2019m honestly kicking myself for even bothering with cabbage and broccoli this year. When are they actually supposed to start heading up anyway? \ud83d\udc15<\/p>\n<\/div>\n<\/div>\n<div class=\"forum-post\">\n<div class=\"author-header\">\n<div class=\"forum-avatar\">G<\/div>\n<div class=\"author-meta\">\n<div class=\"author-name\">gala7496 (Galina) <span class=\"author-stats\">\u2b50 Pro Grower (2,462 posts)<\/span><\/div>\n<div class=\"author-geo\">\ud83d\udccd Unknown Region | \ud83d\udcc5 July 1, 2021<\/div>\n<\/div>\n<\/div>\n<div class=\"post-content\">\n<blockquote><p><strong>Tatka wrote:<\/strong><br \/>\nWhen are they actually supposed to start heading up anyway?<\/p><\/blockquote>\n<p>They should be forming heads by now. I already know what Luda is going to say&#8211;I followed all her tips from last year to the letter. Honestly, I think it just boils down to the seed quality.<\/p>\n<\/div>\n<\/div>\n<div id=\"answer\" class=\"forum-post\">\n<div class=\"author-header\">\n<div class=\"forum-avatar\">A<\/div>\n<div class=\"author-meta\">\n<div class=\"author-name\">Aleksan9ra (Ludmila) <span class=\"author-stats\">\u2b50 Expert \/ Author (15,056 posts)<\/span><\/div>\n<div class=\"author-geo\">\ud83d\udccd Moscow Region (USDA Zone 4b) | \ud83d\udcc5 July 1, 2021<\/div>\n<\/div>\n<\/div>\n<div class=\"post-content\">\n<blockquote><p><strong>Tatka wrote:<\/strong><br \/>\nWhen are they actually supposed to start heading up anyway?<\/p><\/blockquote>\n<p>Tanya! Let&#8217;s troubleshoot and see if something went sideways.<br \/>\n<strong>Here is what broccoli really needs:<\/strong><\/p>\n<ol>\n<li>Pro-grade seeds for spring\/summer growing. If your Mays are hot, you absolutely need heat-tolerant hybrids.<\/li>\n<li>Starts grown in their own individual cups\/plugs.<\/li>\n<li>Pest treatment <em>before<\/em> you transplant them out.<\/li>\n<li>The planting hole needs to be heavily amended (compost, a balanced granular fert, and wood ash).<\/li>\n<li>Heavy feeding for the first 6 weeks. Alternate nitrogen and balanced NPK so the plant pushes about 2 new leaves every single week.<\/li>\n<li>Steady watering &#8211; not soaking wet, but frequent enough to keep it constantly moist.<\/li>\n<li>The end goal: You shouldn\u2019t have a little plant, but a monster bush. It needs to be about 20 inches (50 cm) tall and just as wide, with at least 14 to 16 leaves. (Mine got even bigger than that this year).<\/li>\n<\/ol>\n<p>If you checked all those boxes, then the only culprit left is that crazy heat we had in May.<\/p>\n<p>If there is no embryo of a head forming in the center, you need to cut off that spot and force the plant to push out side shoots. Also, if the bushes look wimpy, give them a feed.<\/p>\n<\/div>\n<\/div>\n<div class=\"forum-post\">\n<div class=\"author-header\">\n<div class=\"forum-avatar\">A<\/div>\n<div class=\"author-meta\">\n<div class=\"author-name\">Aleksan9ra (Ludmila) <span class=\"author-stats\">\u2b50 Expert \/ Author (15,056 posts)<\/span><\/div>\n<div class=\"author-geo\">\ud83d\udccd Moscow Region (USDA Zone 4b) | \ud83d\udcc5 July 1, 2021<\/div>\n<\/div>\n<\/div>\n<div class=\"post-content\">\n<blockquote><p><strong>gala7496 wrote:<\/strong><br \/>\nHonestly, I think it just boils down to the seed quality.<\/p><\/blockquote>\n<p>Galya, in my experience, the seed determines how big the head gets, but not <em>whether<\/em> it forms at all. That is, if they are pro seeds. If they are just cheap retail packets, then all bets are off.<br \/>\nWhat brand were the seeds?<\/p>\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\">Tatka (Tatiana) <span class=\"author-stats\">\u2b50 VIP User (34,939 posts)<\/span><\/div>\n<div class=\"author-geo\">\ud83d\udccd Kazan, Tatarstan (USDA Zone 4a) | \ud83d\udcc5 July 1, 2021<\/div>\n<\/div>\n<\/div>\n<div class=\"post-content\">\n<blockquote><p><strong>Aleksan9ra wrote:<\/strong><br \/>\nIf you checked all those boxes, then the only culprit left is that crazy heat we had in May&#8230;<\/p><\/blockquote>\n<p>Thanks so much, Luda! My bushes are actually massive, the holes were prepped, the ground is always moist, and I fed them right on your schedule.<\/p>\n<p>BUT&#8230; I didn&#8217;t treat them for bugs before transplanting, and my starts weren&#8217;t in individual cups &#8211; they grew in a community flat.<\/p>\n<p>I sprayed them with a Valerian root extract to keep pests away, but it wore off and I totally missed the flea beetles moving in. They shot my leaves full of holes! I eventually hit them with Fitoverm (a biological pesticide), but it rained right after, so who knows if it worked.<br \/>\nAlso, the temperatures in May were higher than I can ever remember.<\/p>\n<blockquote><p><strong>Aleksan9ra wrote:<\/strong><br \/>\nWhat brand were the seeds?<\/p><\/blockquote>\n<p>I bought them online from the &#8220;Sady Rossii&#8221; (Gardens of Russia) catalog.<\/p>\n<\/div>\n<\/div>\n<div class=\"forum-post\">\n<div class=\"author-header\">\n<div class=\"forum-avatar\">L<\/div>\n<div class=\"author-meta\">\n<div class=\"author-name\">LavandaN (Natalia) <span class=\"author-stats\">\u2b50 User (576 posts)<\/span><\/div>\n<div class=\"author-geo\">\ud83d\udccd Moscow Region (USDA Zone 4b) | \ud83d\udcc5 July 1, 2021<\/div>\n<\/div>\n<\/div>\n<div class=\"post-content\">\n<blockquote><p><strong>Aleksan9ra wrote:<\/strong><br \/>\n&#8230;the only culprit left is that crazy heat we had in May.<\/p><\/blockquote>\n<p>My heads only started forming once the rains finally came! But yeah, the bushes themselves grew completely huge.<\/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: 1.1em; line-height: 1.6; border-radius: 0 4px 4px 0;\">\n<h4 style=\"margin-top: 0; color: #1565c0;\">\ud83d\udc68\u200d\ud83d\udd2c Editor&#8217;s Botanical Note: Heat, Roots, and &#8220;Blind&#8221; Broccoli<\/h4>\n<p>This thread highlights two massive pitfalls when growing broccoli: <strong>Heat Stress<\/strong> and <strong>Root Disturbance<\/strong>.<\/p>\n<p><strong>1. The &#8220;Blind&#8221; Broccoli (Heat Stress):<\/strong><br \/>\nBroccoli is a cool-season brassica. If young plants are hit by prolonged high temperatures (above 80\u00b0F \/ 27\u00b0C) before they mature enough to form a crown, they can go &#8220;blind.&#8221; The heat damages the central apical bud, and it stops developing. As LavandaN noted, the heads often magically appear once a cool rain front moves in. If your broccoli goes blind, Ludmila&#8217;s advice is spot on: chop the top center out! This breaks apical dominance and tells the plant to push out side-shoots (florets).<\/p>\n<p><strong>2. The Community Flat Mistake:<\/strong><br \/>\nTatka noted she grew her seeds in a community flat (a large, open tray) rather than individual cell plugs. Broccoli roots absolutely hate being disturbed. Pulling them apart from a community flat causes transplant shock. The plant responds by delaying head formation or producing tiny, premature &#8220;button&#8221; heads. Always start your brassicas in individual plug trays!<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\ud83d\udccc Quick Summary: &#8220;All Leaves, No Crown&#8221; \ud83c\udf21\ufe0f The Heat Factor: Broccoli is notorious for refusing to head up during sudden heatwaves. If your region had a scorching late spring, the plants often stall. Heads usually start forming once the rains and cooler weather roll in. \ud83c\udf31 Root Shock: Starting broccoli seeds in a community &#8230; <a title=\"Why Are Broccoli Plants Growing Huge Leaves but Not Forming Heads in the Summer Heat? (7-Step Checklist)\" class=\"read-more\" href=\"https:\/\/www.tomat-pomidor.com\/en\/why-broccoli-plants-not-forming-heads-in-summer\/\" aria-label=\"Read more about Why Are Broccoli Plants Growing Huge Leaves but Not Forming Heads in the Summer Heat? (7-Step Checklist)\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":4086,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[686],"tags":[1055,1054,1056,1057],"class_list":["post-4086","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cabbages-brassicas","tag-brassica-heat-stress","tag-broccoli-not-heading","tag-flea-beetle-damage","tag-starting-seeds-in-flats"],"_links":{"self":[{"href":"https:\/\/www.tomat-pomidor.com\/en\/wp-json\/wp\/v2\/posts\/4086","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=4086"}],"version-history":[{"count":2,"href":"https:\/\/www.tomat-pomidor.com\/en\/wp-json\/wp\/v2\/posts\/4086\/revisions"}],"predecessor-version":[{"id":4088,"href":"https:\/\/www.tomat-pomidor.com\/en\/wp-json\/wp\/v2\/posts\/4086\/revisions\/4088"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.tomat-pomidor.com\/en\/wp-json\/wp\/v2\/posts\/4086"}],"wp:attachment":[{"href":"https:\/\/www.tomat-pomidor.com\/en\/wp-json\/wp\/v2\/media?parent=4086"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.tomat-pomidor.com\/en\/wp-json\/wp\/v2\/categories?post=4086"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.tomat-pomidor.com\/en\/wp-json\/wp\/v2\/tags?post=4086"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}