{"id":7971,"date":"2025-12-04T17:17:38","date_gmt":"2025-12-04T17:17:38","guid":{"rendered":"https:\/\/www.growshopweb.com\/blog\/?p=7971"},"modified":"2025-12-04T17:17:38","modified_gmt":"2025-12-04T17:17:38","slug":"marijuana-leaves-with-yellow-brown-spots","status":"publish","type":"post","link":"https:\/\/www.growshopweb.com\/blog\/en\/marijuana-leaves-with-yellow-brown-spots\/","title":{"rendered":"Marijuana leaves with yellow\/brown spots"},"content":{"rendered":"<p>In this <a href=\"https:\/\/www.growshopweb.com\" target=\"_blank\" rel=\"noopener\"><b>growshopweb.com<\/b><\/a> blog article, we will discuss a very common issue: marijuana leaves that develop yellow or brown spots.<br \/>\nOur content is <b>purely informational<\/b>: we do not sell marijuana containing THC nor do we encourage its consumption.<br \/>\nIn our store, you will find only fertilizers, nutrients, substrates, measuring instruments, pest control products, and everything needed for responsible home cultivation.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Alternar tabla de contenidos\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.growshopweb.com\/blog\/en\/marijuana-leaves-with-yellow-brown-spots\/#What_are_the_yellowbrown_spots_on_marijuana_leaves\" >What are the yellow\/brown spots on marijuana leaves?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.growshopweb.com\/blog\/en\/marijuana-leaves-with-yellow-brown-spots\/#The_role_of_calcium_in_the_cannabis_plant\" >The role of calcium in the cannabis plant<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.growshopweb.com\/blog\/en\/marijuana-leaves-with-yellow-brown-spots\/#What_are_the_visible_symptoms_of_calcium_deficiency\" >What are the visible symptoms of calcium deficiency?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.growshopweb.com\/blog\/en\/marijuana-leaves-with-yellow-brown-spots\/#What_to_do_in_case_of_calcium_deficiency\" >What to do in case of calcium deficiency?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.growshopweb.com\/blog\/en\/marijuana-leaves-with-yellow-brown-spots\/#Other_causes_of_yellow_and_brown_spots_on_leaves\" >Other causes of yellow and brown spots on leaves<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.growshopweb.com\/blog\/en\/marijuana-leaves-with-yellow-brown-spots\/#Chlorosis_and_NPK_deficiencies\" >Chlorosis and NPK deficiencies<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.growshopweb.com\/blog\/en\/marijuana-leaves-with-yellow-brown-spots\/#Improper_pH_and_overwatering\" >Improper pH and overwatering<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.growshopweb.com\/blog\/en\/marijuana-leaves-with-yellow-brown-spots\/#Pests_and_fungi\" >Pests and fungi<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.growshopweb.com\/blog\/en\/marijuana-leaves-with-yellow-brown-spots\/#Light_burn_and_excessive_heat\" >Light burn and excessive heat<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.growshopweb.com\/blog\/en\/marijuana-leaves-with-yellow-brown-spots\/#How_to_correctly_diagnose_damaged_leaves\" >How to correctly diagnose damaged leaves<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.growshopweb.com\/blog\/en\/marijuana-leaves-with-yellow-brown-spots\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"What_are_the_yellowbrown_spots_on_marijuana_leaves\"><\/span>What are the yellow\/brown spots on marijuana leaves?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>When <b>yellow marijuana spots<\/b> appear or when certain areas darken into <b>brown cannabis leaves<\/b>, the plant is signaling a problem.<br \/>\nThese marks may be caused by a <b>cannabis nutrient deficiency<\/b>, irrigation issues, improper pH, excessive light exposure, <b>fungal marijuana spots<\/b>, or pest attacks.<br \/>\nA proper <b>diagnosis of damaged marijuana leaves<\/b> is essential to restore the plant\u2019s health.<\/p>\n<p>This blog provides general guidance for growers. Each cultivation environment is different, so it&#8217;s important to observe carefully, adjust parameters gradually, and avoid panic.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"The_role_of_calcium_in_the_cannabis_plant\"><\/span>The role of calcium in the cannabis plant<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Calcium is present throughout the plant and is essential for many processes, especially growth.<br \/>\nIt acts as a cellular regulator and contributes to the plant\u2019s overall stability.<br \/>\nThe plant has two internal transport systems: xylem and phloem. Calcium circulates almost exclusively through the xylem, which makes it a low-mobility element within the plant tissues.<br \/>\nFor this reason, it is crucial to ensure a constant supply of calcium in the root zone.<\/p>\n<p>When calcium is lacking, <b>yellow marijuana spots<\/b> with brown edges may appear, along with leaf deformities or necrosis.<br \/>\nThis type of <b>cannabis nutrient deficiency<\/b> often begins on new or intermediate leaves and can spread quickly if not corrected.<\/p>\n<figure id=\"attachment_7972\" aria-describedby=\"caption-attachment-7972\" style=\"width: 700px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.growshopweb.com\/es\/fertilizantes\/canna\/calcio-de-1-litro-canna.html\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" class=\"size-full wp-image-7972 lazyload\" title=\"calcio de 1 litro canna\" data-src=\"https:\/\/www.growshopweb.com\/blog\/wp-content\/uploads\/2025\/12\/calcio-de-1-litro-canna-4.jpg\" alt=\"calcio de 1 litro canna\" width=\"700\" height=\"700\" data-srcset=\"https:\/\/www.growshopweb.com\/blog\/wp-content\/uploads\/2025\/12\/calcio-de-1-litro-canna-4.jpg 700w, https:\/\/www.growshopweb.com\/blog\/wp-content\/uploads\/2025\/12\/calcio-de-1-litro-canna-4-300x300.jpg 300w, https:\/\/www.growshopweb.com\/blog\/wp-content\/uploads\/2025\/12\/calcio-de-1-litro-canna-4-150x150.jpg 150w\" data-sizes=\"(max-width: 700px) 100vw, 700px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 700px; --smush-placeholder-aspect-ratio: 700\/700;\" \/><\/a><figcaption id=\"caption-attachment-7972\" class=\"wp-caption-text\">calcio de 1 litro canna<\/figcaption><\/figure>\n<h3><span class=\"ez-toc-section\" id=\"What_are_the_visible_symptoms_of_calcium_deficiency\"><\/span>What are the visible symptoms of calcium deficiency?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li><b>Yellow\/brown spots<\/b> surrounded by a dark brown edge.<\/li>\n<li>Leaf tips that are burned or dry.<\/li>\n<li>Slow growth and weak structure.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"What_to_do_in_case_of_calcium_deficiency\"><\/span>What to do in case of calcium deficiency?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The most common solution is to add calcium using a calcium nitrate fertilizer or a CalMag supplement.<br \/>\nAt <b>growshopweb.com<\/b>, you will find fertilizer lines and calcium\/magnesium additives designed to correct this type of <b>cannabis nutrient deficiency<\/b>.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Other_causes_of_yellow_and_brown_spots_on_leaves\"><\/span>Other causes of yellow and brown spots on leaves<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Chlorosis_and_NPK_deficiencies\"><\/span>Chlorosis and NPK deficiencies<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><b>Chlorosis in marijuana plants<\/b> is the yellowing of leaves due to a lack of chlorophyll.<br \/>\nIt is often related to <b>cannabis NPK deficiencies<\/b> (nitrogen, phosphorus, potassium) or micronutrient shortages.<br \/>\nIf the leaves start to yellow from the tips or intermediate areas and then develop small brown spots, the fertilization program needs adjustment.<\/p>\n<p>To prevent this, we recommend using fertilizers specifically formulated for cannabis and following a watering schedule appropriate for each growth phase.<br \/>\nIn our online store, you will find growth and bloom fertilizers, boosters, and deficiency correctors.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Improper_pH_and_overwatering\"><\/span>Improper pH and overwatering<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Even with a good fertilizer, if the pH is outside the ideal range, the plant cannot properly absorb nutrients.<br \/>\nThis may cause symptoms similar to a <b>cannabis nutrient deficiency<\/b>, including leaf spots or burns.<\/p>\n<p><b>Overwatering marijuana<\/b> is also very common: roots become deprived of oxygen, leaves turn soft and droopy, then yellow, and eventually brown.<br \/>\nOn the other hand, underwatering results in dry, brittle leaves.<\/p>\n<ul>\n<li>Use pH and EC meters to monitor the nutrient solution.<\/li>\n<li>Use pH- or pH+ products to keep water within the correct range (6.0\u20137.0 in soil, 5.5\u20136.5 in hydroponics).<\/li>\n<li>Choose an airy substrate and allow it to dry slightly between waterings.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Pests_and_fungi\"><\/span>Pests and fungi<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><b>Cannabis leaf pests<\/b> (mites, thrips, aphids\u2026) typically leave small white dots, bites, or discoloration that can evolve into <b>brown cannabis leaves<\/b>.<br \/>\n<b>Fungal spots on marijuana<\/b> commonly appear in humid, poorly ventilated environments.<\/p>\n<p>To detect pests, examine the underside of the leaves with a magnifying glass: eggs, moving specks, or fine webs indicate their presence.<br \/>\nFor fungi, look for irregular, moist, or powdery spots.<\/p>\n<ul>\n<li>Neem oil and potassium soap for organic pest control.<\/li>\n<li>Suitable fungicides (always follow manufacturer instructions).<\/li>\n<li>Fans and extractors to improve air circulation.<\/li>\n<li>Hygrometers to monitor humidity and temperature.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Light_burn_and_excessive_heat\"><\/span>Light burn and excessive heat<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><b>Cannabis light burn<\/b> occurs when the lamp is too close to the canopy or too intense.<br \/>\nUpper leaves may bleach, then turn yellow, and eventually develop dry brown \u201ctoasted\u201d spots.<\/p>\n<p>If you suspect this issue, raise the lamp, reduce power, or adjust the photoperiod depending on the lighting type (LED, HPS\u2026).<br \/>\nA thermometer with a probe and a climate controller are excellent tools for preventing heat-related damage.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_to_correctly_diagnose_damaged_leaves\"><\/span>How to correctly diagnose damaged leaves<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li><b>Visual inspection:<\/b> check where the spots appear and examine both sides of the leaves.<\/li>\n<li><b>Irrigation control:<\/b> too much water = soft leaves; too little water = dry leaves.<\/li>\n<li><b>pH and EC measurement:<\/b> ensure the plant can absorb nutrients properly.<\/li>\n<li><b>Nutritional adjustment:<\/b> correct <b>cannabis NPK deficiencies<\/b> or calcium\/magnesium shortages.<\/li>\n<li><b>Treat pests and fungi:<\/b> apply the appropriate product when needed.<\/li>\n<\/ul>\n<p>At <b>growshopweb.com<\/b>, we do not sell marijuana containing THC, but we offer all the materials needed for healthy home cultivation: fertilizers, CalMag supplements, pH\/EC meters, pest control products, organic fungicides, and accessories to optimize your grow space.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Yellow or brown spots on cannabis leaves do not necessarily mean your cultivation is lost, but they are a warning sign.<br \/>\nBy learning to identify whether the problem is due to <b>chlorosis in marijuana plants<\/b>, irrigation mistakes, <b>pests on cannabis leaves<\/b>, <b>fungal marijuana spots<\/b>, <b>cannabis NPK deficiencies<\/b>, or <b>light burn on cannabis<\/b>, you can act in time and save your harvest.<\/p>\n<p>This blog is purely informational and aimed at home growers who want to improve their techniques.<br \/>\nIn our online store, you will find everything you need to keep your plants healthy and prevent the appearance of <b>brown cannabis leaves<\/b> or <b>yellow marijuana spots<\/b>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In this growshopweb.com blog article, we will discuss a very common issue: marijuana leaves that develop yellow or brown spots. Our content is purely informational: we do not sell marijuana containing THC nor do we encourage its consumption. In our store, you will find only fertilizers, nutrients, substrates, measuring instruments, pest control products, and everything [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":7956,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3248],"tags":[],"class_list":["post-7971","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-advice"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Marijuana leaves with yellow\/brown spots \u2013 Tips<\/title>\n<meta name=\"description\" content=\"Marijuana leaves with yellow\/brown spots \u2013 Tips and solutions for healthy and efficient home cultivation. 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