{"id":15303,"date":"2023-12-16T05:57:00","date_gmt":"2023-12-16T09:57:00","guid":{"rendered":"https:\/\/www.naturenb.ca\/?p=15303"},"modified":"2026-02-16T12:31:46","modified_gmt":"2026-02-16T16:31:46","slug":"cultivons-lasclepiade-incarnate-1","status":"publish","type":"post","link":"https:\/\/www.naturenb.ca\/fr\/cultivons-lasclepiade-incarnate-1\/","title":{"rendered":"Cultivons l&#8217;ascl\u00e9piade incarnate, Chapitre 1 : Introduction aux semis d&#8217;hiver pour les papillons monarques"},"content":{"rendered":"\n<div class=\"wp-block-uagb-advanced-heading uagb-block-61c5cc08\"><h2 class=\"uagb-heading-text\"><strong>Cultivons l&#8217;ascl\u00e9piade incarnate, Chapitre 1 : Introduction aux semis d&#8217;hiver pour les papillons monarques<\/strong><\/h2><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Par Samuel LeGresley, coordonnateur des communications \u00e0 Nature NB<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/www.naturenb.ca\/wp-content\/uploads\/2023\/12\/406427789_6506893686082096_2542218578408083277_n-1024x683.jpg\" alt=\"A hummingbid on Swamp Milkweed\" class=\"wp-image-15280\" srcset=\"https:\/\/www.naturenb.ca\/sites\/www.naturenb.ca\/wp-content\/uploads\/2023\/12\/406427789_6506893686082096_2542218578408083277_n-1024x683.jpg 1024w, https:\/\/www.naturenb.ca\/sites\/www.naturenb.ca\/wp-content\/uploads\/2023\/12\/406427789_6506893686082096_2542218578408083277_n-300x200.jpg 300w, https:\/\/www.naturenb.ca\/sites\/www.naturenb.ca\/wp-content\/uploads\/2023\/12\/406427789_6506893686082096_2542218578408083277_n-768x512.jpg 768w, https:\/\/www.naturenb.ca\/sites\/www.naturenb.ca\/wp-content\/uploads\/2023\/12\/406427789_6506893686082096_2542218578408083277_n-1536x1024.jpg 1536w, https:\/\/www.naturenb.ca\/sites\/www.naturenb.ca\/wp-content\/uploads\/2023\/12\/406427789_6506893686082096_2542218578408083277_n.jpg 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Un colibri sur l&#8217;Ascl\u00e9piade incarnate. <em>Photo: Pierre Janin<\/em><\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Beaucoup de nos plantes indig\u00e8nes ont besoin d&#8217;un peu de soins particuliers pour germer, mais il n&#8217;y a rien de trop compliqu\u00e9 si vous avez l&#8217;espace et le temps d&#8217;exp\u00e9rimenter. Embarquez dans cette aventure de plantation avec Nature NB en <a href=\"https:\/\/www.naturenb.ca\/fr\/monarques\/graines-dasclepiade\/?lang=fr\">commandant vos graines d&#8217;ascl\u00e9piade<\/a> et en semant avec nous ! Depuis quelques ann\u00e9es, Nature NB envoie des paquets de graines d&#8217;ascl\u00e9piade incarnate en \u00e9change d&#8217;un petit don. Si vous n&#8217;avez pas encore les v\u00f4tres, il n&#8217;est pas trop tard pour les commander et commencer l\u2019aventure !<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L&#8217;ascl\u00e9piade incarnate est un excellent moyen d&#8217;attirer de nombreux pollinisateurs, dont le papillon monarque, dont la chenille se nourrit de ses feuilles. Le statut d&#8217;esp\u00e8ce en voie de disparition attribu\u00e9 r\u00e9cemment au monarque par l&#8217;UICN a suscit\u00e9 une grande prise de conscience de cette esp\u00e8ce et de sa situation critique.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L&#8217;habitat de ce papillon doit comprendre des plantes du genre des ascl\u00e9piades (<em>Asclepias <\/em>sp.). Apr\u00e8s une exposition \u00e0 cette plante pour plusieurs millions d&#8217;ann\u00e9es, le syst\u00e8me digestif du papillon a non seulement d\u00e9velopp\u00e9 des enzymes pr\u00eates \u00e0 dig\u00e9rer le latex toxique de l&#8217;ascl\u00e9piade, mais son comportement consiste \u00e9galement \u00e0 mordre la feuille \u00e0 la base, afin d&#8217;emp\u00eacher l&#8217;\u00e9coulement de grandes quantit\u00e9s de latex. Cette sp\u00e9cialisation a cependant un co\u00fbt, car c&#8217;est le seul genre de plantes capable de nourrir ses larves.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les ascl\u00e9piades indig\u00e8nes sont l&#8217;ascl\u00e9piade commune (<em>Asclepias syriaca<\/em>) et l&#8217;ascl\u00e9piade incarnate (<em>Asclepias incarnata<\/em>). L&#8217;ascl\u00e9piade incarnate est mieux adapt\u00e9e aux jardins car elle ne se propage pas par des tiges souterraines (rhizomes), contrairement \u00e0 sa cousine commune. Toutes deux sont originaires de cette r\u00e9gion et abritent une multitude d&#8217;autres insectes qui s&#8217;en nourrissent, ainsi que du nectar pour notre seul colibri (\u00e0 gorge rubis).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Mais il y a un b\u00e9mol : comme la floraison de la plante ne dure que pendant les mois tr\u00e8s chauds de l&#8217;\u00e9t\u00e9, des plantes \u00e0 floraison tardive sont n\u00e9cessaires pour compl\u00e9ter le r\u00e9gime alimentaire des monarques et leur donner suffisamment de nourriture pour leur migration vers le Mexique.On peut penser aux asters (<em>Symphyotrichum spp.<\/em>, par exemple) et aux verges d&#8217;or (<em>Solidago spp.<\/em>). Cela signifie que nous devons incorporer dans nos jardins des plantes qui fleurissent \u00e0 plusieurs saisons et laisser des parties de grands terrains comme des prairies non tondues o\u00f9 ces esp\u00e8ces peuvent se d\u00e9velopper naturellement.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cependant, ces plantes ne sont pas aussi faciles \u00e0 obtenir dans les p\u00e9pini\u00e8res et n\u00e9cessitent un traitement sp\u00e9cial pour germer. Explorons cela ensemble.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Semis d&#8217;hiver&nbsp;<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cultiver cette plante \u00e0 partir de graines n&#8217;est pas aussi simple que de les r\u00e9pandre sur le sol au printemps. Vous obtiendrez peut-\u00eatre quelques plantules de cette fa\u00e7on, mais les taux de germination seront d\u00e9risoires et il sera plus difficile d&#8217;en suivre l&#8217;\u00e9volution, m\u00eame si vous le faites \u00e0 l&#8217;automne, o\u00f9 le processus peut se d\u00e9rouler de fa\u00e7on naturelle. C&#8217;est pourquoi, sur les paquets envoy\u00e9s par Nature NB et pr\u00e9par\u00e9s par les <em>Maritime Monarch Watchers<\/em>, nous recommandons une m\u00e9thode de stratification au r\u00e9frig\u00e9rateur de 6 \u00e0 9 semaines, dans laquelle les graines sont plac\u00e9es dans un milieu de culture humide dans un sac en plastique et transplant\u00e9es dans des pots une fois qu&#8217;elles ont germ\u00e9.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cette ann\u00e9e, nous testons une m\u00e9thode diff\u00e9rente. Pour imiter les cycles de la nature, de nombreuses personnes ont essay\u00e9 la m\u00e9thode \u00e9prouv\u00e9e des semis d&#8217;hiver, y compris la Grainoth\u00e8que de fleurs sauvages d&#8217;Ottawa, dont la fondatrice a \u00e9t\u00e9 <a href=\"https:\/\/www.naturenb.ca\/fr\/5-questions-avec-melanie-ouellette\/?lang=fr\" target=\"_blank\" rel=\"noreferrer noopener\">pr\u00e9sent\u00e9e dans notre dernier blog 5 questions.<\/a> Continuez \u00e0 lire pour une s\u00e9rie de liens des ressources de la Grainoth\u00e8que.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cette m\u00e9thode a ses avantages, car elle ne n\u00e9cessite qu&#8217;un emplacement ext\u00e9rieur o\u00f9 le soleil est partiel (pas orient\u00e9 vers le sud) et o\u00f9 les graines peuvent subir toute une gamme de conditions m\u00e9t\u00e9orologiques (c&#8217;est-\u00e0-dire pas sous un auvent ou une toiture). Il est \u00e9galement conseill\u00e9 de placer un grillage au-dessus des r\u00e9cipients afin que les graines ne soient pas vol\u00e9es par les oiseaux ou les rongeurs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Avec l&#8217;arriv\u00e9e de la neige en d\u00e9cembre et janvier, il est temps de v\u00e9rifier les pr\u00e9visions m\u00e9t\u00e9orologiques de votre r\u00e9gion. S&#8217;il n&#8217;y a pas de pluie ou de p\u00e9riodes chaudes pour la semaine et qu&#8217;il s&#8217;agit d&#8217;une p\u00e9riode post\u00e9rieure \u00e0 la mi-d\u00e9cembre ou \u00e0 la fin d\u00e9cembre, il est peut-\u00eatre temps de commencer les semis d&#8217;hiver !<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Un moyen de rompre la dormance<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Chez les plantes, la dormance signifie, selon l&#8217;esp\u00e8ce, que l&#8217;enveloppe de la graine est trop \u00e9paisse pour que l&#8217;embryon puisse se d\u00e9velopper, ou que des processus chimiques emp\u00eachent l&#8217;embryon de se d\u00e9velopper. Dans la nature, cela s&#8217;explique notamment par le fait que la graine pourrait mourir si elle commen\u00e7ait \u00e0 pousser juste apr\u00e8s \u00eatre tomb\u00e9e de la plante (<a href=\"https:\/\/agsci.oregonstate.edu\/mes\/sustainable-wildflower-seed-production\/germination-seed-dormancy\">source<\/a>).Quel que soit le type de dormance, nous devons aider les plantes \u00e0 en sortir. Pour savoir si une plante contenant de grosses graines est vivante ou non, il suffit de la couper \u00e0 l&#8217;aide d&#8217;un couteau X-Acto.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"692\" height=\"414\" src=\"https:\/\/www.naturenb.ca\/wp-content\/uploads\/2023\/12\/pasted-image-0-1.png\" alt=\"\" class=\"wp-image-15291\" style=\"aspect-ratio:1.671497584541063;width:319px;height:auto\" srcset=\"https:\/\/www.naturenb.ca\/sites\/www.naturenb.ca\/wp-content\/uploads\/2023\/12\/pasted-image-0-1.png 692w, https:\/\/www.naturenb.ca\/sites\/www.naturenb.ca\/wp-content\/uploads\/2023\/12\/pasted-image-0-1-300x179.png 300w\" sizes=\"auto, (max-width: 692px) 100vw, 692px\" \/><figcaption class=\"wp-element-caption\">Un test de coupe de l&#8217;Ascl\u00e9piade incarnate d\u00e9montre l&#8217;endosperme blanch\u00e2tre.<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image alignright size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"692\" height=\"923\" src=\"https:\/\/www.naturenb.ca\/wp-content\/uploads\/2023\/12\/IMG_3165.jpg\" alt=\"\" class=\"wp-image-15282\" style=\"aspect-ratio:0.7497291440953413;width:390px;height:auto\" srcset=\"https:\/\/www.naturenb.ca\/sites\/www.naturenb.ca\/wp-content\/uploads\/2023\/12\/IMG_3165.jpg 692w, https:\/\/www.naturenb.ca\/sites\/www.naturenb.ca\/wp-content\/uploads\/2023\/12\/IMG_3165-225x300.jpg 225w\" sizes=\"auto, (max-width: 692px) 100vw, 692px\" \/><figcaption class=\"wp-element-caption\">La machine \u00e0 rayons X au Centre des semences d&#8217;arbre montre les graines d&#8217;ascl\u00e9piade incarnate avec leur endosperme en blanc.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">D&#8217;autre part, je me suis rendu au Centre national des semences d&#8217;arbres \u00e0 Fredericton pour effectuer un test sp\u00e9cial aux rayons X dans une machine con\u00e7ue pour un usage m\u00e9dical, mais achet\u00e9e pour v\u00e9rifier si les graines ont un endosperme vivant, la partie qui donne la nourriture \u00e0 l&#8217;embryon. Sur cette image, on peut voir un lot de graines d&#8217;ascl\u00e9piade incarnate, prises parmi celles que nous vous envoyons, et elles ont toutes un endosperme blanc ! Cela signifie qu&#8217;elles semblent tr\u00e8s saines et pr\u00eates \u00e0 entreprendre le processus de lev\u00e9e de la dormance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Un test de coupe donnera des r\u00e9sultats similaires en montrant un endosperme blanc, mais il tue la graine. Une fa\u00e7on de g\u00e9rer ce probl\u00e8me est de prendre un petit \u00e9chantillon de vos semences indig\u00e8nes, de les couper et de calculer le pourcentage de graines pleines (c&#8217;est-\u00e0-dire blanches \u00e0 l&#8217;int\u00e9rieur) par rapport aux graines vides.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Cultivons l\u2019ascl\u00e9piade ensemble! \u00c9tape 1 : Commandez et semez.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Voici quelques ressources pour vous aider \u00e0 faire pousser vos plantes.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.naturenb.ca\/fr\/monarques\/graines-dasclepiade\/?lang=fr\">Allez \u00e0 ce formulaire pour commander des graines d&#8217;ascl\u00e9piade incarnate aupr\u00e8s de Nature NB.<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.youtube.com\/watch?v=hUnM6en3W38&amp;list=PLB1nj5Po588NCfDFPkq400MpjBOL2b5kc\">Cette s\u00e9rie de vid\u00e9os de la Grainoth\u00e8que de fleurs sauvages d&#8217;Ottawa vous explique en quelques mots ce processus facile.&nbsp;<\/a>(en anglais)<\/li>\n\n\n\n<li>L&#8217;initiative Seed Sitters de la Fondation David Suzuki a des <a href=\"https:\/\/davidsuzuki.org\/take-action\/act-locally\/butterflyway\/seed-sitters\/\">guides et des instructions sur comment faire des semis d&#8217;hiver<\/a>.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Nous vous donnerons rendez-vous en janvier, lorsque le personnel de Nature NB aura commenc\u00e9 \u00e0 cultiver l&#8217;ascl\u00e9piade et d&#8217;autres plantes indig\u00e8nes \u00e0 l&#8217;ext\u00e9rieur ! Envisagez de vous joindre \u00e0 nous en cultivant chez vous avant ou pendant la prochain chapitre de cette s\u00e9rie sur la culture de l&#8217;ascl\u00e9piade incarnate.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Cultivons l&#8217;ascl\u00e9piade incarnate, Chapitre 1 : Introduction aux semis d&#8217;hiver pour les papillons monarques Par Samuel LeGresley, coordonnateur des communications \u00e0 Nature NB Beaucoup de nos plantes indig\u00e8nes ont besoin [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":15281,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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