{"id":43329,"date":"2026-05-24T10:10:45","date_gmt":"2026-05-24T10:10:45","guid":{"rendered":"https:\/\/webonsai.com\/?p=43329"},"modified":"2026-05-24T11:05:39","modified_gmt":"2026-05-24T11:05:39","slug":"proteger-bonsai-canicule","status":"publish","type":"post","link":"https:\/\/webonsai.com\/it\/proteger-bonsai-canicule\/","title":{"rendered":"Comment prot\u00e9ger son bonsai pendant une canicule\u00a0?"},"content":{"rendered":"<p>Une canicule arrive vite. Trop souvent, on s\u2019en aper\u00e7oit le matin quand les feuilles pendent d\u00e9j\u00e0 et que le substrat sent la terre cuite. \u00c0 ce stade, il faut agir, pas r\u00e9fl\u00e9chir.<\/p>\n<p>J\u2019ai perdu un gen\u00e9vrier de douze ans lors de la canicule de 2017. La chaleur \u00e9tait pr\u00e9visible, j\u2019avais n\u00e9glig\u00e9 d\u2019anticiper. Depuis, je pr\u00e9pare mes bonsais d\u00e8s que les pr\u00e9visions annoncent plus de 35\u00a0\u00b0C sur plusieurs jours. \u00c7a change tout.<\/p>\n<p>La bonne nouvelle, c\u2019est qu\u2019un bonsai bien pr\u00e9par\u00e9 passe une canicule sans probl\u00e8me. Ce n\u2019est pas une plante fragile \u2014 c\u2019est une plante qui a besoin qu\u2019on adapte ses conditions \u00e0 la saison.<\/p>\n<h2>Ce que la chaleur fait vraiment \u00e0 un bonsai<\/h2>\n<p>Les d\u00e9g\u00e2ts d\u2019une canicule ne viennent pas toujours de l\u00e0 o\u00f9 on croit.<\/p>\n<p>La chaleur directe sur les feuilles provoque des br\u00fblures, surtout entre 12h et 16h. Mais c\u2019est souvent le pot surchauff\u00e9 qui cause le plus de dommages\u00a0: un pot fonc\u00e9 expos\u00e9 au soleil de plein midi peut monter \u00e0 50\u201355\u00a0\u00b0C \u00e0 la surface. \u00c0 cette temp\u00e9rature, les racines p\u00e9riph\u00e9riques meurent en quelques heures.<\/p>\n<p>L\u2019\u00e9vaporation s\u2019acc\u00e9l\u00e8re aussi fortement. Un substrat sec en deux heures au lieu de douze, c\u2019est possible en plein cagnard. Et un bonsai assoiff\u00e9 et stress\u00e9 par la chaleur est beaucoup plus vuln\u00e9rable aux araign\u00e9es rouges.<\/p>\n<h2>Les causes de d\u00e9g\u00e2ts les plus fr\u00e9quentes<\/h2>\n<p><strong>Le soleil de l\u2019apr\u00e8s-midi.<\/strong> La lumi\u00e8re du matin est utile. Celle entre 13h et 17h en ao\u00fbt peut br\u00fbler m\u00eame des esp\u00e8ces robustes comme le ficus ou l\u2019orme de Chine.<\/p>\n<p><strong>Un pot trop expos\u00e9.<\/strong> Les pots noirs ou en c\u00e9ramique sombre absorbent la chaleur. Sans ombrage lat\u00e9ral, ils deviennent des radiateurs pour les racines.<\/p>\n<p><strong>Un arrosage mal tim\u00e9.<\/strong> Arroser en pleine chaleur cr\u00e9e un choc thermique sur les racines. L\u2019eau froide sur un substrat \u00e0 45\u00a0\u00b0C ne fait pas du bien.<\/p>\n<p><strong>L\u2019absence de pr\u00e9paration.<\/strong> Beaucoup de pertes surviennent parce que rien n\u2019a \u00e9t\u00e9 fait avant que la canicule s\u2019installe.<\/p>\n<h2>Comment \u00e9valuer la situation\u00a0: bonsai canicule<\/h2>\n<p>Avant de d\u00e9cider quoi faire, observe ce que tu as.<\/p>\n<p>Regarde l\u2019exposition de tes bonsais aux diff\u00e9rentes heures de la journ\u00e9e. Re\u00e7oivent-ils du soleil apr\u00e8s 13h\u00a0? C\u2019est le premier point \u00e0 corriger.<\/p>\n<p>Touche le pot. S\u2019il est br\u00fblant \u00e0 la main apr\u00e8s quelques secondes de contact, les racines sont en danger. Si le substrat est compl\u00e8tement sec avant midi, le rythme d\u2019arrosage ne convient pas.<\/p>\n<p>Examine les feuilles. Des br\u00fblures bl\u00e2ch\u00e2tres ou dor\u00e9es sur les parties expos\u00e9es, des feuilles qui pendent mollement \u2014 ce sont les premiers signaux.<\/p>\n<div class=\"bonsai-artifact-fr\">\n<style>.bonsai-artifact-fr{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;max-width:680px;margin:2em auto;background:#fdfcfa;border:1px solid #d5cec5;border-radius:8px;padding:24px 28px;box-sizing:border-box;color:#2a2a2a}.bonsai-artifact-fr h3{font-size:1.05rem;font-weight:700;color:#3a5438;margin:0 0 4px}.bonsai-artifact-fr .ba-sub{font-size:.84rem;color:#7a7268;margin:0 0 18px}.bonsai-artifact-fr .ba-section{font-size:.76rem;font-weight:700;text-transform:uppercase;letter-spacing:.07em;color:#8a7a6a;margin:16px 0 7px}.bonsai-artifact-fr .ba-item{display:flex;align-items:flex-start;gap:11px;padding:8px 0;border-bottom:1px solid #ece7e0;cursor:pointer;user-select:none}.bonsai-artifact-fr .ba-item.done .ba-label{text-decoration:line-through;color:#b0a898}.bonsai-artifact-fr .ba-box{width:20px;height:20px;min-width:20px;border:2px solid #b0a48c;border-radius:4px;background:#fff;display:flex;align-items:center;justify-content:center;margin-top:1px;transition:background .15s,border-color .15s}.bonsai-artifact-fr .ba-item.done .ba-box{background:#3a5438;border-color:#3a5438}.bonsai-artifact-fr .ba-box svg{display:none}.bonsai-artifact-fr .ba-item.done .ba-box svg{display:block}.bonsai-artifact-fr .ba-label{font-size:.91rem;line-height:1.45}.bonsai-artifact-fr .ba-note{font-size:.79rem;color:#7a6f62;margin-top:2px}.bonsai-artifact-fr .ba-bar-wrap{margin-top:18px;background:#ece7e0;border-radius:6px;height:8px;overflow:hidden}.bonsai-artifact-fr .ba-bar{height:100%;background:#3a5438;border-radius:6px;width:0;transition:width .3s ease}.bonsai-artifact-fr .ba-result{margin-top:9px;font-size:.87rem;font-weight:600;color:#3a5438;min-height:1.3em}.bonsai-artifact-fr .ba-reset{margin-top:13px;background:none;border:1px solid #c5b8a8;border-radius:5px;padding:5px 13px;font-size:.81rem;color:#7a6f62;cursor:pointer}.bonsai-artifact-fr .ba-reset:hover{background:#f2ece4}<\/style>\n<h3>Checklist canicule bonsai<\/h3>\n<p class=\"ba-sub\">Coche les points d\u00e9j\u00e0 appliqu\u00e9s \u2014 le score s\u2019affiche en bas.<\/p>\n<div class=\"ba-section\">Avant la canicule<\/div>\n<div class=\"ba-item\" onclick=\"bafr(this)\">\n<div class=\"ba-box\"><svg width=\"12\" height=\"10\" viewBox=\"0 0 12 10\" fill=\"none\"><path d=\"M1 5l3.5 3.5L11 1\" stroke=\"#fff\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/><\/svg><\/div>\n<div>\n<div class=\"ba-label\">Identifier les bonsais expos\u00e9s au soleil apr\u00e8s 13h<\/div>\n<div class=\"ba-note\">Le soleil de l\u2019apr\u00e8s-midi est le plus dangereux<\/div>\n<\/div>\n<\/div>\n<div class=\"ba-item\" onclick=\"bafr(this)\">\n<div class=\"ba-box\"><svg width=\"12\" height=\"10\" viewBox=\"0 0 12 10\" fill=\"none\"><path d=\"M1 5l3.5 3.5L11 1\" stroke=\"#fff\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/><\/svg><\/div>\n<div>\n<div class=\"ba-label\">Installer un filet d\u2019ombrage \u00e0 40\u201350\u00a0%<\/div>\n<div class=\"ba-note\">L\u2019air doit circuler \u2014 \u00e9viter les tissus qui retiennent la chaleur<\/div>\n<\/div>\n<\/div>\n<div class=\"ba-item\" onclick=\"bafr(this)\">\n<div class=\"ba-box\"><svg width=\"12\" height=\"10\" viewBox=\"0 0 12 10\" fill=\"none\"><path d=\"M1 5l3.5 3.5L11 1\" stroke=\"#fff\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/><\/svg><\/div>\n<div>\n<div class=\"ba-label\">V\u00e9rifier que le pot ne surchauffe pas au toucher<\/div>\n<div class=\"ba-note\">Un pot br\u00fblant = racines en danger. Envelopper de jute humide<\/div>\n<\/div>\n<\/div>\n<div class=\"ba-item\" onclick=\"bafr(this)\">\n<div class=\"ba-box\"><svg width=\"12\" height=\"10\" viewBox=\"0 0 12 10\" fill=\"none\"><path d=\"M1 5l3.5 3.5L11 1\" stroke=\"#fff\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/><\/svg><\/div>\n<div>\n<div class=\"ba-label\">Arr\u00eater la fertilisation<\/div>\n<div class=\"ba-note\">Reprendre apr\u00e8s la canicule, quand les temp\u00e9ratures baissent<\/div>\n<\/div>\n<\/div>\n<div class=\"ba-section\">Pendant la canicule<\/div>\n<div class=\"ba-item\" onclick=\"bafr(this)\">\n<div class=\"ba-box\"><svg width=\"12\" height=\"10\" viewBox=\"0 0 12 10\" fill=\"none\"><path d=\"M1 5l3.5 3.5L11 1\" stroke=\"#fff\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/><\/svg><\/div>\n<div>\n<div class=\"ba-label\">Arroser t\u00f4t le matin (avant 8h)<\/div>\n<div class=\"ba-note\">Jamais en pleine chaleur \u2014 choc thermique sur les racines<\/div>\n<\/div>\n<\/div>\n<div class=\"ba-item\" onclick=\"bafr(this)\">\n<div class=\"ba-box\"><svg width=\"12\" height=\"10\" viewBox=\"0 0 12 10\" fill=\"none\"><path d=\"M1 5l3.5 3.5L11 1\" stroke=\"#fff\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/><\/svg><\/div>\n<div>\n<div class=\"ba-label\">Arroser une deuxi\u00e8me fois en soir\u00e9e (apr\u00e8s 20h)<\/div>\n<div class=\"ba-note\">Submersion 10 min pour saturer compl\u00e8tement le substrat<\/div>\n<\/div>\n<\/div>\n<div class=\"ba-item\" onclick=\"bafr(this)\">\n<div class=\"ba-box\"><svg width=\"12\" height=\"10\" viewBox=\"0 0 12 10\" fill=\"none\"><path d=\"M1 5l3.5 3.5L11 1\" stroke=\"#fff\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/><\/svg><\/div>\n<div>\n<div class=\"ba-label\">V\u00e9rifier l\u2019humidit\u00e9 du substrat avant chaque arrosage<\/div>\n<div class=\"ba-note\">En canicule le substrat s\u00e8che vite \u2014 adapter la fr\u00e9quence<\/div>\n<\/div>\n<\/div>\n<div class=\"ba-item\" onclick=\"bafr(this)\">\n<div class=\"ba-box\"><svg width=\"12\" height=\"10\" viewBox=\"0 0 12 10\" fill=\"none\"><path d=\"M1 5l3.5 3.5L11 1\" stroke=\"#fff\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/><\/svg><\/div>\n<div>\n<div class=\"ba-label\">Surveiller les premiers signes de stress<\/div>\n<div class=\"ba-note\">Feuilles pendantes, br\u00fblures \u2014 intervenir t\u00f4t<\/div>\n<\/div>\n<\/div>\n<div class=\"ba-item\" onclick=\"bafr(this)\">\n<div class=\"ba-box\"><svg width=\"12\" height=\"10\" viewBox=\"0 0 12 10\" fill=\"none\"><path d=\"M1 5l3.5 3.5L11 1\" stroke=\"#fff\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/><\/svg><\/div>\n<div>\n<div class=\"ba-label\">Grouper les pots pour cr\u00e9er une micro-humidit\u00e9<\/div>\n<div class=\"ba-note\">Les pots group\u00e9s se prot\u00e8gent mutuellement<\/div>\n<\/div>\n<\/div>\n<div class=\"ba-section\">Apr\u00e8s la canicule<\/div>\n<div class=\"ba-item\" onclick=\"bafr(this)\">\n<div class=\"ba-box\"><svg width=\"12\" height=\"10\" viewBox=\"0 0 12 10\" fill=\"none\"><path d=\"M1 5l3.5 3.5L11 1\" stroke=\"#fff\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/><\/svg><\/div>\n<div>\n<div class=\"ba-label\">Inspecter les feuilles et rameaux<\/div>\n<div class=\"ba-note\">Attendre avant de tailler \u2014 ce qui semble mort peut repartir<\/div>\n<\/div>\n<\/div>\n<div class=\"ba-item\" onclick=\"bafr(this)\">\n<div class=\"ba-box\"><svg width=\"12\" height=\"10\" viewBox=\"0 0 12 10\" fill=\"none\"><path d=\"M1 5l3.5 3.5L11 1\" stroke=\"#fff\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/><\/svg><\/div>\n<div>\n<div class=\"ba-label\">Reprendre la fertilisation 2\u20133 semaines apr\u00e8s, dose r\u00e9duite<\/div>\n<div class=\"ba-note\">Laisser la plante se remettre avant de relancer la croissance<\/div>\n<\/div>\n<\/div>\n<div class=\"ba-item\" onclick=\"bafr(this)\">\n<div class=\"ba-box\"><svg width=\"12\" height=\"10\" viewBox=\"0 0 12 10\" fill=\"none\"><path d=\"M1 5l3.5 3.5L11 1\" stroke=\"#fff\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/><\/svg><\/div>\n<div>\n<div class=\"ba-label\">V\u00e9rifier les araign\u00e9es rouges (dessous des feuilles)<\/div>\n<div class=\"ba-note\">Elles prolif\u00e8rent apr\u00e8s les vagues de chaleur<\/div>\n<\/div>\n<\/div>\n<div class=\"ba-bar-wrap\">\n<div class=\"ba-bar\" id=\"bafr-bar\"><\/div>\n<\/div>\n<div class=\"ba-result\" id=\"bafr-result\">Coche les points pour voir ton score.<\/div>\n<p><button class=\"ba-reset\" onclick=\"bafrReset()\">Recommencer<\/button><br \/>\n<script>function bafr(el){el.classList.toggle('done');bafrUpdate();}function bafrUpdate(){var items=document.querySelectorAll('.bonsai-artifact-fr .ba-item');var done=document.querySelectorAll('.bonsai-artifact-fr .ba-item.done').length;var pct=Math.round(done\/items.length*100);document.getElementById('bafr-bar').style.width=pct+'%';var msg='';if(done===0)msg='Coche les points pour voir ton score.';else if(pct<30)msg='D\u00e9but de pr\u00e9paration \u2014 plusieurs points critiques restent \u00e0 couvrir.';else if(pct<60)msg='Pr\u00e9paration partielle \u2014 continue sur le timing d\u2019arrosage.';else if(pct<85)msg='Bonne pr\u00e9paration \u2014 quelques ajustements et tes bonsais sont prot\u00e9g\u00e9s.';else msg='Excellent \u2014 tes bonsais sont pr\u00eats \u00e0 passer la canicule.';document.getElementById('bafr-result').textContent=msg;}function bafrReset(){document.querySelectorAll('.bonsai-artifact-fr .ba-item').forEach(function(el){el.classList.remove('done');});document.getElementById('bafr-bar').style.width='0%';document.getElementById('bafr-result').textContent='Coche les points pour voir ton score.';}\n<\/script><\/div>\n<h2>Ce qu\u2019il faut faire, dans l\u2019ordre<\/h2>\n<p><strong>D\u00e9placer avant tout.<\/strong> Si le bonsai re\u00e7oit du soleil apr\u00e8s 13h, d\u00e9place-le en ombre partielle l\u2019apr\u00e8s-midi. Sous une pergola, le long d\u2019un mur nord-est, ou sous un filet d\u2019ombrage \u00e0 40\u201350\u00a0%.<\/p>\n<p><strong>Installer un filet d\u2019ombrage.<\/strong> Un filet \u00e0 40\u00a0% suffit pour la plupart des esp\u00e8ces. J\u2019utilise un filet agricole tendu sur des piquets bambou, \u00e7a co\u00fbte peu et \u00e7a prot\u00e8ge efficacement.<\/p>\n<p><strong>Adapter l\u2019arrosage.<\/strong> En canicule, je passe \u00e0 deux arrosages par jour\u00a0: un t\u00f4t le matin (avant 8h) et un en fin de soir\u00e9e (apr\u00e8s 20h). La submersion \u2014 plonger le pot dans un bac d\u2019eau pendant 10 minutes \u2014 est excellente le soir pour saturer le substrat.<\/p>\n<p><strong>Prot\u00e9ger les pots.<\/strong> Entourer les pots de jute humide, les grouper pour cr\u00e9er une micro-humidit\u00e9. Pour mes pots les plus sombres, je les peins en blanc \u00e0 la chaux sur les c\u00f4t\u00e9s expos\u00e9s.<\/p>\n<p><strong>Ne pas fertiliser.<\/strong> Une plante stress\u00e9e absorbe tr\u00e8s mal les engrais. Reprends quand les temp\u00e9ratures redescendent sous 30\u00a0\u00b0C.<\/p>\n<h2>Apr\u00e8s la canicule<\/h2>\n<p>Examine toutes les feuilles. Les br\u00fblures l\u00e9g\u00e8res ne n\u00e9cessitent rien. Les br\u00fblures profondes sur de nombreux rameaux m\u00e9ritent attention\u00a0: attends avant de tailler pour voir ce qui repart.<\/p>\n<p>Reprends progressivement la fertilisation deux \u00e0 trois semaines apr\u00e8s, avec une dose r\u00e9duite. Pour aller plus loin, notre article sur <a href=\"https:\/\/webonsai.com\/arrosage-bonsai-ete\/\">l\u2019arrosage du bonsai en \u00e9t\u00e9<\/a> d\u00e9taille les soins estivaux.<\/p>\n<h2>Questions fr\u00e9quentes<\/h2>\n<p><strong>Faut-il rentrer les bonsais \u00e0 l\u2019int\u00e9rieur pendant une canicule\u00a0?<\/strong><br \/>Seulement si tu n\u2019as pas d\u2019ombrage ext\u00e9rieur. \u00c0 l\u2019int\u00e9rieur, la luminosit\u00e9 chute et l\u2019air est sec. Un ombrage ext\u00e9rieur bien pens\u00e9 est pr\u00e9f\u00e9rable.<\/p>\n<p><strong>Mon bonsai a les feuilles fl\u00e9tries apr\u00e8s la canicule \u2014 que faire\u00a0?<\/strong><br \/>Arroser par submersion le soir, mettre \u00e0 l\u2019ombre totale 48 heures. Si rien ne bouge au bout de deux semaines, fais le scratch test sur quelques rameaux.<\/p>\n<p><strong>Les bonsais tropicaux supportent-ils mieux la chaleur\u00a0?<\/strong><br \/>Mieux en g\u00e9n\u00e9ral, mais ils souffrent quand m\u00eame de la s\u00e9cheresse du substrat. Les m\u00eames r\u00e8gles s\u2019appliquent.<\/p>\n<p><strong>Est-ce qu\u2019un bassin d\u2019eau sous le pot aide\u00a0?<\/strong><br \/>\u00c7a augmente l\u2019humidit\u00e9 locale. Ne pas laisser le pot baigner directement dans l\u2019eau \u2014 les racines risquent l\u2019asphyxie. Un lit de graviers suffit.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Bonsai et canicule\u00a0: ce qu\u2019il faut faire avant, pendant et apr\u00e8s une vague de chaleur. Conseils pratiques d\u2019un cultivateur exp\u00e9riment\u00e9.<\/p>\n","protected":false},"author":2,"featured_media":43337,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[272],"tags":[],"class_list":["post-43329","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog-fr"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Comment prot\u00e9ger son bonsai pendant une canicule\u00a0?<\/title>\n<meta name=\"description\" content=\"Bonsai et canicule\u00a0: ce qu\u2019il faut faire avant, pendant et apr\u00e8s une vague de chaleur pour \u00e9viter les d\u00e9g\u00e2ts. 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