{"id":1381,"date":"2005-06-27T22:41:00","date_gmt":"2005-06-27T22:41:00","guid":{"rendered":"http:\/\/blogs.thesocialmedia.com\/leblogjardin\/2005\/06\/27\/les-hortensias-2\/"},"modified":"2012-08-27T09:45:37","modified_gmt":"2012-08-27T09:45:37","slug":"les-hortensias-2","status":"publish","type":"post","link":"https:\/\/blogs.thesocialmedia.com\/leblogjardin\/2005\/06\/27\/les-hortensias-2\/","title":{"rendered":"Les hortensias bleus"},"content":{"rendered":"

\"Hortensia_bleu_penombre1024\"<\/a> Les hortensias bleus ont quelque chose de fascinant, voire myst\u00e9rieux; leur bleu peut \u00eatre tellement intense, qu’il y a de quoi s’interroger sur les m\u00e9thodes employ\u00e9es par les fleuristes, pour obtenir de telles couleurs. Pourtant, la r\u00e9ponse est simple, chaque vari\u00e9t\u00e9 d’hortensia (hydrangea), r\u00e9agit de fa\u00e7on diff\u00e9rente \u00e0 l’acidit\u00e9 du sol; <\/p>\n

Les plus sensibles bleuissent facilement, m\u00eame en sol peu acide; c’est le cas de "Blue Bird", "Nikko Blue", "Mousseline", etc…<\/p>\n

D’autres r\u00e9clament un sol bien acide, avec en plus, des apports chimiques bleuissants; c’est le cas pour "Blue Wave", "B\u00e9n\u00e9lux", "Altona", "Europa", "Kluis Superba", etc…<\/p>\n

Les autres sont beaucoup plus r\u00e9fractaires, comme "Hambourg", ou "Merveille", ou incapables de devenir bleus, comme les vari\u00e9t\u00e9s \u00e0 fleurs blanches, rouges ou pourpres. <\/p>\n

Notez \u00e9galement que seuls, les Hydrangea <\/a>x macrophylla et serrata<\/a>, r\u00e9agissent ainsi \u00e0 l’acidit\u00e9 du sol, mais inutile d’essayer de faire bleuir les esp\u00e8ces paniculata<\/a>, arborescens<\/a>, quercifolia<\/a> ou sargentiana, ce serait peine perdue.<\/p>\n

Si vous r\u00eavez donc de beaux hortensias bleus, la premi\u00e8re chose \u00e0 faire est l’analyse de votre sol, pour en conna\u00eetre l’acidit\u00e9; des kits sont vendus pour cet usage en jardinerie. L’id\u00e9al est un ph inf\u00e9rieur \u00e0 7; au-del\u00e0 de ce chiffre, il vous faudra, soit faire des apports de terre de bruy\u00e8re, soit des apports renouvel\u00e9s de produits bleuissants, ou de produits tendant \u00e0 acidifier le sol. Il reste aussi la m\u00e9thode "maison", qui consiste \u00e0 jeter quelques poign\u00e9es de clous rouill\u00e9s, d’ardoise pil\u00e9e, ou d’alun dans le sol.<\/p>\n","protected":false},"excerpt":{"rendered":"

Les hortensias bleus ont quelque chose de fascinant, voire myst\u00e9rieux; leur bleu peut \u00eatre tellement intense, qu’il y a de quoi s’interroger sur les m\u00e9thodes employ\u00e9es par les fleuristes, pour obtenir de telles couleurs. Pourtant, la r\u00e9ponse est simple, chaque vari\u00e9t\u00e9 d’hortensia (hydrangea), r\u00e9agit de fa\u00e7on diff\u00e9rente \u00e0 l’acidit\u00e9 du sol; Les plus sensibles bleuissent […]<\/p>\n","protected":false},"author":358,"featured_media":1976,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-1381","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fleurs"],"yoast_head":"\nLes hortensias bleus - Le blog jardin<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.thesocialmedia.com\/leblogjardin\/2005\/06\/27\/les-hortensias-2\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Les hortensias bleus - Le blog jardin\" \/>\n<meta property=\"og:description\" content=\"Les hortensias bleus ont quelque chose de fascinant, voire myst\u00e9rieux; leur bleu peut \u00eatre tellement intense, qu’il y a de quoi s’interroger sur les m\u00e9thodes employ\u00e9es par les fleuristes, pour obtenir de telles couleurs. Pourtant, la r\u00e9ponse est simple, chaque vari\u00e9t\u00e9 d’hortensia (hydrangea), r\u00e9agit de fa\u00e7on diff\u00e9rente \u00e0 l’acidit\u00e9 du sol; Les plus sensibles bleuissent […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blogs.thesocialmedia.com\/leblogjardin\/2005\/06\/27\/les-hortensias-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Le blog jardin\" \/>\n<meta property=\"article:published_time\" content=\"2005-06-27T22:41:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2012-08-27T09:45:37+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blogs.thesocialmedia.com\/leblogjardin\/files\/2012\/08\/hortensia_bleu_penombre1024.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"640\" \/>\n\t<meta property=\"og:image:height\" content=\"480\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"christine pomart\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"christine pomart\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/blogs.thesocialmedia.com\/leblogjardin\/2005\/06\/27\/les-hortensias-2\/\",\"url\":\"https:\/\/blogs.thesocialmedia.com\/leblogjardin\/2005\/06\/27\/les-hortensias-2\/\",\"name\":\"Les hortensias bleus - 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