{"id":6107,"date":"2025-01-26T10:01:13","date_gmt":"2025-01-26T03:01:13","guid":{"rendered":"https:\/\/kla.vn\/?p=6107"},"modified":"2025-01-26T16:02:56","modified_gmt":"2025-01-26T09:02:56","slug":"tannin","status":"publish","type":"post","link":"https:\/\/kla.vn\/en\/plant-science\/tannin\/","title":{"rendered":"Tannins in Growing Media: Explanation, Effects and Treatment"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Tannins are naturally occurring organic compounds commonly found in tree bark, leaves, and fruits. In horticulture, tannins are found in <a href=\"https:\/\/kla.vn\/en\/plant-care\/family-in-law\/\">growing medium <\/a>will affect the growth of plants. This article will provide detailed but easy to understand information about tannins, their effects on growing media and how to deal with them effectively.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What is Tannin?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Tannin belongs to the polyphenol group, known as a substance that can combine with proteins and heavy metals. In nature, <a href=\"https:\/\/vi.wikipedia.org\/wiki\/Tanin\" target=\"_blank\" rel=\"noopener\">tannin <\/a>has the effect of protecting plants from pathogenic microorganisms and predators. The main source of tannins in growing media usually comes from:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Bark, trunk<\/strong>: Oak bark, pine bark.<\/li>\n\n\n\n<li><strong>Leaf<\/strong>: Leaves such as coconut leaves, acacia leaves, oak leaves.<\/li>\n\n\n\n<li><strong>Fruit<\/strong>: Coconut shell, grape skin, seeds<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Tannins are divided into <strong>two main types<\/strong> based on chemical structure and decomposition characteristics<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"850\" height=\"471\" src=\"https:\/\/kla.vn\/wp-content\/uploads\/2025\/01\/Tannin-trong-gia-the-Giai-thich-anh-huong-va-xu-ly-1.png\" alt=\"Tannins in Growing Media: Explanation, Effects and Treatment\" class=\"wp-image-6109\" title=\"\" srcset=\"https:\/\/kla.vn\/wp-content\/uploads\/2025\/01\/Tannin-trong-gia-the-Giai-thich-anh-huong-va-xu-ly-1.png 850w, https:\/\/kla.vn\/wp-content\/uploads\/2025\/01\/Tannin-trong-gia-the-Giai-thich-anh-huong-va-xu-ly-1-300x166.png 300w, https:\/\/kla.vn\/wp-content\/uploads\/2025\/01\/Tannin-trong-gia-the-Giai-thich-anh-huong-va-xu-ly-1-768x426.png 768w, https:\/\/kla.vn\/wp-content\/uploads\/2025\/01\/Tannin-trong-gia-the-Giai-thich-anh-huong-va-xu-ly-1-150x83.png 150w, https:\/\/kla.vn\/wp-content\/uploads\/2025\/01\/Tannin-trong-gia-the-Giai-thich-anh-huong-va-xu-ly-1-696x386.png 696w, https:\/\/kla.vn\/wp-content\/uploads\/2025\/01\/Tannin-trong-gia-the-Giai-thich-anh-huong-va-xu-ly-1-600x332.png 600w\" sizes=\"auto, (max-width: 850px) 100vw, 850px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Condensed Tannins<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Condensed tannins are formed from flavonoid units linked together. They are common in plants, especially wood, bark, and seeds.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Hydrolyzable Tannins<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Hydrolyzable tannins consist of polyphenol compounds bound to sugars or phenolic acids (such as gallic acid or ellagic acid).<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u201cCoconut shells are used as a growing medium but contain a lot of tannins\u201d<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">5 effects of tannin in growing medium <\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/kla.vn\/wp-content\/uploads\/2025\/01\/Anh-huong-cua-tannin.jpg\" alt=\"Tannins in Growing Media: Explanation, Effects and Treatment\" class=\"wp-image-6114\" title=\"\" srcset=\"https:\/\/kla.vn\/wp-content\/uploads\/2025\/01\/Anh-huong-cua-tannin.jpg 800w, https:\/\/kla.vn\/wp-content\/uploads\/2025\/01\/Anh-huong-cua-tannin-300x225.jpg 300w, https:\/\/kla.vn\/wp-content\/uploads\/2025\/01\/Anh-huong-cua-tannin-768x576.jpg 768w, https:\/\/kla.vn\/wp-content\/uploads\/2025\/01\/Anh-huong-cua-tannin-150x113.jpg 150w, https:\/\/kla.vn\/wp-content\/uploads\/2025\/01\/Anh-huong-cua-tannin-696x522.jpg 696w, https:\/\/kla.vn\/wp-content\/uploads\/2025\/01\/Anh-huong-cua-tannin-600x450.jpg 600w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\">1. Change the pH of the soil<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Tannins are acidic and can lower the pH of the growing medium, which affects the plant&#039;s ability to absorb nutrients.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">See also: <a href=\"https:\/\/kla.vn\/en\/plant-care\/ph-for-indoor-plants-2\/\">\u0110\u1ed9 pH cho c\u00e2y trong nh\u00e0: gi\u1ea3i th\u00edch, h\u01b0\u1edbng d\u1eabn chi ti\u1ebft<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. Effects on beneficial microorganisms<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Tannins have antibacterial properties that can kill or inhibit the growth of beneficial microorganisms in the soil, such as nitrogen-fixing bacteria or mycorrhizae. This reduces the efficiency of nutrient absorption by the roots.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. Potential toxicity to plants<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">If tannin concentrations are too high, they can be toxic to plant roots, slowing growth or causing root burn.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4. Reduced ability to absorb nutrients<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Tannin combines with iron and precipitates minerals, making it impossible for plants to absorb them. <a href=\"https:\/\/kla.vn\/en\/plant-care\/complete-nutrition-of-plants-and-fruits-2\/\">important nutrients<\/a>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">5. Impact on soil structure<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">As tannin accumulates in the soil, it can interact with other organic compounds, changing the soil structure. This can reduce drainage and aeration, negatively affecting root growth.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Signs of plants affected by tannins<\/strong><\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"800\" src=\"https:\/\/kla.vn\/wp-content\/uploads\/2025\/01\/Tannin-trong-gia-the.jpg\" alt=\"Tannins in Growing Media: Explanation, Effects and Treatment\" class=\"wp-image-6112\" title=\"\" srcset=\"https:\/\/kla.vn\/wp-content\/uploads\/2025\/01\/Tannin-trong-gia-the.jpg 600w, https:\/\/kla.vn\/wp-content\/uploads\/2025\/01\/Tannin-trong-gia-the-225x300.jpg 225w, https:\/\/kla.vn\/wp-content\/uploads\/2025\/01\/Tannin-trong-gia-the-150x200.jpg 150w, https:\/\/kla.vn\/wp-content\/uploads\/2025\/01\/Tannin-trong-gia-the-300x400.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><figcaption class=\"wp-element-caption\">Weak roots due to growing medium containing a lot of tannins<\/figcaption><\/figure>\n<\/div>\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Yellow or withered leaves:<\/strong> Plants do not absorb enough nutrients, causing leaves to turn yellow or wither.<\/li>\n\n\n\n<li><strong>Slow root growth:<\/strong> The root system is weakened, resulting in slow or no growth of the plant.<\/li>\n\n\n\n<li><strong>Root burn phenomenon:<\/strong> White or brown root areas may be a sign of burning due to the action of tannins.<\/li>\n\n\n\n<li><strong>Low microbial yield:<\/strong> Limit biological processes in the substrate, resulting in poor soil fertility.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to handle tannin in growing medium<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"667\" src=\"https:\/\/kla.vn\/wp-content\/uploads\/2025\/01\/Tannin-trong-gia-the-Giai-thich-anh-huong-va-xu-ly-2.jpg\" alt=\"Tannins in Growing Media: Explanation, Effects and Treatment\" class=\"wp-image-6110\" title=\"\" srcset=\"https:\/\/kla.vn\/wp-content\/uploads\/2025\/01\/Tannin-trong-gia-the-Giai-thich-anh-huong-va-xu-ly-2.jpg 1000w, https:\/\/kla.vn\/wp-content\/uploads\/2025\/01\/Tannin-trong-gia-the-Giai-thich-anh-huong-va-xu-ly-2-300x200.jpg 300w, https:\/\/kla.vn\/wp-content\/uploads\/2025\/01\/Tannin-trong-gia-the-Giai-thich-anh-huong-va-xu-ly-2-768x512.jpg 768w, https:\/\/kla.vn\/wp-content\/uploads\/2025\/01\/Tannin-trong-gia-the-Giai-thich-anh-huong-va-xu-ly-2-150x100.jpg 150w, https:\/\/kla.vn\/wp-content\/uploads\/2025\/01\/Tannin-trong-gia-the-Giai-thich-anh-huong-va-xu-ly-2-696x464.jpg 696w, https:\/\/kla.vn\/wp-content\/uploads\/2025\/01\/Tannin-trong-gia-the-Giai-thich-anh-huong-va-xu-ly-2-600x400.jpg 600w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\">Method 1: Soak the fabric in water<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Before using growing media such as coconut peat, coconut fiber, coconut lumps or bark, soak and wash with water to remove excess tannin. In coconut fiber, tannin content is about 2.5%, has a salty taste, is soluble in water but precipitates protein, so it is necessary to remove tannin in coconut fiber before planting. <\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Method 2: Soak with lime<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Tannin is an acidic organic compound that reduces the plant&#039;s ability to absorb nutrients when using coconut fiber as a substrate. Lime solution <strong>Ca(OH)\u2082<\/strong> Alkaline, helps neutralize tannic acid, making coconut fiber safer for plants.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Method 3: Check the pH in the pot<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Regularly check the pH of the growing medium and adjust if necessary with lime or buffer solution.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Method 4: Use additives to reduce tannins<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Add organic buffers (such as treated manure) to neutralize the effects of tannins.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/kla.vn\/wp-content\/uploads\/2025\/01\/xo-dua-1.jpg\" alt=\"5 lo\u1ea1i gi\u00e1 th\u1ec3 tr\u1ed3ng c\u00e2y t\u1eeb d\u1eeba: Hi\u1ec7u qu\u1ea3 v\u00e0 th\u00e2n thi\u1ec7n m\u00f4i tr\u01b0\u1eddng\" class=\"wp-image-6099\" title=\"\" srcset=\"https:\/\/kla.vn\/wp-content\/uploads\/2025\/01\/xo-dua-1.jpg 800w, https:\/\/kla.vn\/wp-content\/uploads\/2025\/01\/xo-dua-1-300x225.jpg 300w, https:\/\/kla.vn\/wp-content\/uploads\/2025\/01\/xo-dua-1-768x576.jpg 768w, https:\/\/kla.vn\/wp-content\/uploads\/2025\/01\/xo-dua-1-150x113.jpg 150w, https:\/\/kla.vn\/wp-content\/uploads\/2025\/01\/xo-dua-1-696x522.jpg 696w, https:\/\/kla.vn\/wp-content\/uploads\/2025\/01\/xo-dua-1-600x450.jpg 600w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Not all tannins are harmful, and the degree of impact depends on the plant, the concentration of tannins in the soil, and the environment in which the plant lives. Some plants have evolved to adapt to or even use tannins to prevent competition from other species (allelopathy).<\/p>","protected":false},"excerpt":{"rendered":"<p>Tannins are naturally occurring organic compounds that are commonly found in tree bark, leaves, and fruits. In the field of horticulture, tannins in the growing medium (planting material) will affect the growth of plants. This article will provide detailed but easy-to-understand information about tannins, the effects of [\u2026]<\/p>","protected":false},"author":3,"featured_media":6116,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[359],"tags":[306,315,312,361],"class_list":["post-6107","post","type-post","status-publish","format-standard","has-post-thumbnail","category-plant-science","tag-gia-the","tag-gia-the-trong-cay","tag-kien-thuc-can-ban","tag-tannin"],"_links":{"self":[{"href":"https:\/\/kla.vn\/en\/wp-json\/wp\/v2\/posts\/6107","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kla.vn\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kla.vn\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kla.vn\/en\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/kla.vn\/en\/wp-json\/wp\/v2\/comments?post=6107"}],"version-history":[{"count":0,"href":"https:\/\/kla.vn\/en\/wp-json\/wp\/v2\/posts\/6107\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/kla.vn\/en\/wp-json\/wp\/v2\/media\/6116"}],"wp:attachment":[{"href":"https:\/\/kla.vn\/en\/wp-json\/wp\/v2\/media?parent=6107"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kla.vn\/en\/wp-json\/wp\/v2\/categories?post=6107"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kla.vn\/en\/wp-json\/wp\/v2\/tags?post=6107"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}