{"id":1257,"date":"2020-05-19T23:06:53","date_gmt":"2020-05-19T23:06:53","guid":{"rendered":"https:\/\/weedmaps.com\/learn\/cbd\/how-to-identify-and-avoid-bud-rot"},"modified":"2026-02-22T15:11:42","modified_gmt":"2026-02-22T15:11:42","slug":"identify-and-avoid-bud-rot","status":"publish","type":"post","link":"https:\/\/weedmaps.com\/learn\/the-plant\/identify-and-avoid-bud-rot","title":{"rendered":"How to identify and avoid bud rot"},"content":{"rendered":"<div id=\"bsf_rt_marker\"><\/div>\n<p><span style=\"font-weight: 400\">Just like the satisfaction of a home-made cake can spur some to learn baking, a home-grown joint can tempt many cannabis aficionados into becoming growers. For beginner cultivators raising healthy plants can be one of the steepest learning curves. The rapidity at which a rogue fungus or mold can destroy a plant is breathtaking. <\/span><a href=\"https:\/\/www.tandfonline.com\/doi\/full\/10.1080\/07060661.2018.1535467\" target=\"_blank\" rel=\"noopener noreferrer\"><span style=\"font-weight: 400\">Infected buds can be destroyed in as little as a week<\/span><\/a><span style=\"font-weight: 400\">.<\/span><\/p>\n\n\n\t\t\t<figure class=\"wp-block-image size-large\">\t\t\t<a href=\"https:\/\/weedmaps.com\/learn\/wp-content\/uploads\/2020\/07\/032A1703-4.jpg\" data-modal-open=\"lightbox_1258\">\n\t\t\t\t<img decoding=\"async\" src=\"https:\/\/weedmaps.com\/learn\/wp-content\/uploads\/2020\/07\/032A1703-4-768x512.jpg\" srcset=\"https:\/\/weedmaps.com\/learn\/wp-content\/uploads\/2020\/07\/032A1703-4.jpg 1600w, https:\/\/weedmaps.com\/learn\/wp-content\/uploads\/2020\/07\/032A1703-4-300x200.jpg 300w, https:\/\/weedmaps.com\/learn\/wp-content\/uploads\/2020\/07\/032A1703-4-1024x682.jpg 1024w, https:\/\/weedmaps.com\/learn\/wp-content\/uploads\/2020\/07\/032A1703-4-768x512.jpg 768w, https:\/\/weedmaps.com\/learn\/wp-content\/uploads\/2020\/07\/032A1703-4-1536x1023.jpg 1536w\" sizes=\"(min-width: 768px) 476px, (min-width: 1218px) 772px, 100vw\" alt=\"withered marijuana plant\" title=\"Click to see a larger version of the image\">\n\t\t\t<\/a><cite>Photo by: Gina Coleman\/Weedmaps<\/cite><figcaption>The rapidity at which a rogue fungus or mold can destroy a plant is breathtaking.&nbsp;<\/figcaption><\/figure>\t\t\t<div id=\"lightbox_1258\" data-modal data-modal-hide-heading data-modal-manual-close hidden>\n\t\t\t\t<h2>Image lightbox<\/h2>\n\t\t\t\t<img decoding=\"async\" src=\"https:\/\/weedmaps.com\/learn\/wp-content\/uploads\/2020\/07\/032A1703-4-768x512.jpg\" srcset=\"https:\/\/weedmaps.com\/learn\/wp-content\/uploads\/2020\/07\/032A1703-4.jpg 1600w, https:\/\/weedmaps.com\/learn\/wp-content\/uploads\/2020\/07\/032A1703-4-300x200.jpg 300w, https:\/\/weedmaps.com\/learn\/wp-content\/uploads\/2020\/07\/032A1703-4-1024x682.jpg 1024w, https:\/\/weedmaps.com\/learn\/wp-content\/uploads\/2020\/07\/032A1703-4-768x512.jpg 768w, https:\/\/weedmaps.com\/learn\/wp-content\/uploads\/2020\/07\/032A1703-4-1536x1023.jpg 1536w\" sizes=\"100vw\" alt=\"withered marijuana plant\">\n\t\t\t\t<button role=\"button\" class=\"a11y-modal__close-btn\" data-modal-close-btn>\n\t\t\t\t\t<svg width=\"24\" height=\"24\" viewBox=\"0 0 24 24\" fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M13.414 12l4.293 4.293a1 1 0 01-1.414 1.414L12 13.414l-4.293 4.293a1 1 0 11-1.414-1.414L10.586 12 6.293 7.707a1 1 0 011.414-1.414L12 10.586l4.293-4.293a1 1 0 011.414 1.414L13.414 12z\"\/><\/svg>\n\t\t\t\t<\/button>\n\t\t\t<\/div>\n\n\n<p><span style=\"font-weight: 400\">One of the most common diseases new growers encounter is bud rot, also known as botrytis cinerea, or gray mold. Bud rot can wreak havoc on crops if left unchecked, so the ability to detect its signs early and prevent it will help ensure healthy plants.<\/span><\/p>\n\n\n\n<h2 class=\"wm-article-table-of-contents-header\" id=\"what-is-bud-rot-and-when-does-it-occur\">\n\tWhat is bud rot, and when does it occur?<\/h2>\n\n\n\n<p><span style=\"font-weight: 400\">Bud rot is a fungal pathogen or a type of mold that develops in the heart of cannabis buds. While the appearance of the fungus often<\/span><a href=\"https:\/\/www.tandfonline.com\/doi\/full\/10.1080\/07060661.2018.1535467?af=R\" target=\"_blank\" rel=\"noopener noreferrer\"><span style=\"font-weight: 400\"> occurs in the later stages of flower development<\/span><\/a><span style=\"font-weight: 400\">, it usually permeates the bud tissue at an earlier stage in the crop development but remains dormant. When the environment becomes conducive, the mold rapidly rots the buds from the inside by crumbling the surrounding layers, spreading out in all directions.&nbsp;<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400\">Usually, denser buds are affected, but in some cases, patches may become visible over the entire plant. As the mold spreads, it can produce and transmit spores to other plants. Mold can also become an issue after harvest during the drying process.&nbsp;<\/span><\/p>\n\n\n\n<h2 class=\"wm-article-table-of-contents-header\" id=\"how-do-you-detect-bud-rot\">\n\tHow do you detect bud rot?<\/h2>\n\n\n\n<p><span style=\"font-weight: 400\">If you're new to growing cannabis and unsure of how to detect bud rod, here are some signs to look for:<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><b>Discoloration in and around the bud<\/b><\/h3>\n\n\n\n<p><span style=\"font-weight: 400\">According to Danny Danko, author of <\/span><a href=\"https:\/\/amzn.to\/2HHvVnJ\" target=\"_blank\" rel=\"noopener noreferrer\"><span style=\"font-weight: 400\">Cannabis: A Beginner's Guide to Growing Marijuana<\/span><\/a><i><span style=\"font-weight: 400\">,<\/span><\/i><span style=\"font-weight: 400\"> there are several giveaways that indicate the onset of bud rot. \u201dThe first sign of bud rot will be a discoloration of flowers and the short leaves protruding from them,\u201d says Danko. \u201cThe buds will have pockets of brown, gray, or black (dark purple) chunks that look dry and crumbly.\u201d Danko recommends using a magnifying glass or loupe to examine buds.<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400\">Bud rot initially appears as pale, powdery mildew on buds, but becomes darker in color as the bud assumes a slimy consistency. When the mold has fully taken hold, the infected bud will easily separate, showing a dark, dusty interior. The dust is mold spores.<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><b>Dark or dried-up colas<\/b><\/h3>\n\n\n\n<p><a href=\"https:\/\/weedmaps.com\/learn\/dictionary\/cola\/\" target=\"_blank\" rel=\"noopener noreferrer\"><span style=\"font-weight: 400\">The colas<\/span><\/a><span style=\"font-weight: 400\">, or central flower clusters that form in the upper portion of the main stems, may also hint at bud rot. Colas which appear dried up or darker in color can indicate the presence of mold. A diseased cola will stand out in contrast to the healthy tissue of the plant, making it relatively easy for even newbie growers to see that something is amiss.<\/span><\/p>\n\n\n\t\t\t<figure class=\"wp-block-image size-large\">\t\t\t<a href=\"https:\/\/weedmaps.com\/learn\/wp-content\/uploads\/2020\/07\/032A1828-3.jpg\" data-modal-open=\"lightbox_1259\">\n\t\t\t\t<img decoding=\"async\" src=\"https:\/\/weedmaps.com\/learn\/wp-content\/uploads\/2020\/07\/032A1828-3-768x512.jpg\" srcset=\"https:\/\/weedmaps.com\/learn\/wp-content\/uploads\/2020\/07\/032A1828-3.jpg 1600w, https:\/\/weedmaps.com\/learn\/wp-content\/uploads\/2020\/07\/032A1828-3-300x200.jpg 300w, https:\/\/weedmaps.com\/learn\/wp-content\/uploads\/2020\/07\/032A1828-3-1024x682.jpg 1024w, https:\/\/weedmaps.com\/learn\/wp-content\/uploads\/2020\/07\/032A1828-3-768x512.jpg 768w, https:\/\/weedmaps.com\/learn\/wp-content\/uploads\/2020\/07\/032A1828-3-1536x1023.jpg 1536w\" sizes=\"(min-width: 768px) 476px, (min-width: 1218px) 772px, 100vw\" alt=\"dry marijuana plant\" title=\"Click to see a larger version of the image\">\n\t\t\t<\/a><cite>Photo by: Gina Coleman\/Weedmaps<\/cite><figcaption>Colas which appear dried up or darker in color can indicate the presence of mold.&nbsp;<\/figcaption><\/figure>\t\t\t<div id=\"lightbox_1259\" data-modal data-modal-hide-heading data-modal-manual-close hidden>\n\t\t\t\t<h2>Image lightbox<\/h2>\n\t\t\t\t<img decoding=\"async\" src=\"https:\/\/weedmaps.com\/learn\/wp-content\/uploads\/2020\/07\/032A1828-3-768x512.jpg\" srcset=\"https:\/\/weedmaps.com\/learn\/wp-content\/uploads\/2020\/07\/032A1828-3.jpg 1600w, https:\/\/weedmaps.com\/learn\/wp-content\/uploads\/2020\/07\/032A1828-3-300x200.jpg 300w, https:\/\/weedmaps.com\/learn\/wp-content\/uploads\/2020\/07\/032A1828-3-1024x682.jpg 1024w, https:\/\/weedmaps.com\/learn\/wp-content\/uploads\/2020\/07\/032A1828-3-768x512.jpg 768w, https:\/\/weedmaps.com\/learn\/wp-content\/uploads\/2020\/07\/032A1828-3-1536x1023.jpg 1536w\" sizes=\"100vw\" alt=\"dry marijuana plant\">\n\t\t\t\t<button role=\"button\" class=\"a11y-modal__close-btn\" data-modal-close-btn>\n\t\t\t\t\t<svg width=\"24\" height=\"24\" viewBox=\"0 0 24 24\" fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M13.414 12l4.293 4.293a1 1 0 01-1.414 1.414L12 13.414l-4.293 4.293a1 1 0 11-1.414-1.414L10.586 12 6.293 7.707a1 1 0 011.414-1.414L12 10.586l4.293-4.293a1 1 0 011.414 1.414L13.414 12z\"\/><\/svg>\n\t\t\t\t<\/button>\n\t\t\t<\/div>\n\n\n<h3 class=\"wp-block-heading\"><b>Yellow leaves&nbsp;<\/b><\/h3>\n\n\n\n<p><span style=\"font-weight: 400\">The sudden emergence of yellow leaves attached to colas can be a sign that there is mold at the base of the leaves. Yellow leaves with bud rot often fall out easily. Close inspection of the leaves may reveal mold spores close to the cola.<\/span><\/p>\n\n\n\n<h2 class=\"wm-article-table-of-contents-header\" id=\"can-moldy-buds-be-saved\">\n\tCan moldy buds be saved?<\/h2>\n\n\n\n<p><span style=\"font-weight: 400\">Once a bud begins to show signs of bud rot, it is unsafe for consumption and must be discarded. \u201cIn some cases, when discovered early, a grower can cut out the parts of the flowers affected by bud rot and reduce the spread,\u201d explains Danko. \u201cUse sanitized and sterile tools and clean them often to avoid spreading the spores.\u201d&nbsp;<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400\">After the infected bud or buds have been removed, the rest of the plant can be allowed to grow. However, if there is a widespread infection, destruction of the plant may be prudent to avoid infecting other plants nearby.<\/span><\/p>\n\n\n\n<h2 class=\"wm-article-table-of-contents-header\" id=\"how-do-you-prevent-bud-rot-outside-and-inside\">\n\tHow do you prevent bud rot outside and inside?<\/h2>\n\n\n\n<p><span style=\"font-weight: 400\">According to Danko, bud rot tends to be more prevalent in outdoor plants, such as those in climates with humid fall weather like northern California or the Pacific Northwest.<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400\">One of the difficulties of <\/span><a href=\"https:\/\/bsppjournals.onlinelibrary.wiley.com\/doi\/full\/10.1111\/j.1364-3703.2007.00417.x\" target=\"_blank\" rel=\"noopener noreferrer\"><span style=\"font-weight: 400\">plant mold is that it is such a pervasive pathogen<\/span><\/a><span style=\"font-weight: 400\">. Bud rot can be caused by several different hosts and&nbsp;<\/span><a href=\"https:\/\/bsppjournals.onlinelibrary.wiley.com\/doi\/full\/10.1111\/j.1364-3703.2007.00417.x\" target=\"_blank\" rel=\"noopener noreferrer\"><span style=\"font-weight: 400\">it can survive for extended periods of time in crop debris<\/span><\/a><span style=\"font-weight: 400\">. Awareness of the microenvironments and climates in which the fungus thrives can help prevent bud rot.<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400\">Danko advises that the best way to keep outdoor plants dry is to protect them from rain and morning dew, and place them far enough apart that they aren't touching. \u201cCover the plants with a tarp, which doesn't touch the plant tops, or use a greenhouse enclosure to keep them dry. If they do get wet, shake them so that pockets of moisture don't form,\u201d he says.<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400\">For those wondering does rain cause bud rot, the answer is that rainy weather fosters conditions conducive to bud rot. The problem is that high humidity and dampness accompany rain, supplying a source of moisture for mold growth on buds.<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400\">\u201cCultivators in areas prone to bud rot should consider growing plants that are more resistant to mold and powdery mildew,\u201d states Danko. \u201cSeeds can be purchased for plants that have acclimated to overly wet conditions.\u201d Seeds that show mold-resistant properties or a higher tolerance to damp conditions include Durban Poison, Brazil Amazonia, and Colombian Gold.<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400\">Another option for wetter climates is timing your planting to avoid the onset of the rainy seasons. <\/span><a href=\"https:\/\/weedmaps.com\/learn\/dictionary\/auto-flower\/\" target=\"_blank\" rel=\"noopener noreferrer\"><span style=\"font-weight: 400\">Auto-flowering cultivars<\/span><\/a><span style=\"font-weight: 400\">, which start flowering when they reach a certain age, regardless of photoperiod, can be planted in the spring and harvested during the summer, before the wet fall season.&nbsp;<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400\">Danko also recommends removing some of the lower leaves that fan out on bushy plants to promote airflow beneath the canopy -- this goes for both outdoor and indoor plants.<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400\">The best way to support indoor plants is by encouraging air circulation. An oscillating fan can efficiently keep air moving inside. \u201cUse proper filtration for all air entering your room and seal off any places air can get in that isn't filtered, such as cracks under doors,\u201d explains Danko.<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400\">\u201cKeep your grow room on the warmer side, between 70-80 degrees F and maintain a relative humidity of 40-50 percent.\u201d<\/span><\/p>\n\n\n\n<p>Nighttime temperatures should be 10-15 degrees below daytime temperatures so the flowers have a chance to cool down internally. This helps the root system in the same manner. Humidity at night for preventing mold should be 40% or lower.<\/p>\n\n\n\n<p><a href=\"https:\/\/npic.orst.edu\/factsheets\/neemgen.html\" target=\"_blank\" rel=\"noopener noreferrer\"><span style=\"font-weight: 400\">Neem oil, which is a non-toxic oil derived from the neem tree<\/span><\/a><span style=\"font-weight: 400\">, is a natural fungicide. It can be diluted and sprayed onto the plant to help ward off the fungi that promote bud rot.&nbsp;<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400\">It's also critical to avoid bud rot after you've harvested your buds. Leaving space between hanging branches as they dry, creating an optimal drying environment, or even speed-drying, can help prevent the conditions in which mold spores thrive.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Just like the satisfaction of a home-made cake can spur some to learn baking, a home-grown joint can tempt many cannabis aficionados into becoming growers. For beginner cultivators raising healthy plants can be one of the steepest learning curves. The rapidity at which a rogue...<\/p>\n","protected":false},"author":15,"featured_media":1261,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[110],"tags":[1267,1360,1361,1362,1363,1364],"class_list":["post-1257","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-the-plant","tag-cultivation-troubleshooting","tag-bud-rot-cannabis","tag-botrytis-cannabis","tag-cannabis-mold-prevention","tag-flower-stage-problems","tag-humidity-control-cannabis"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v18.9 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>How to identify and avoid bud rot | Weedmaps<\/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:\/\/weedmaps.com\/learn\/the-plant\/identify-and-avoid-bud-rot\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to identify and avoid bud rot\" \/>\n<meta property=\"og:description\" content=\"Just like the satisfaction of a home-made cake can spur some to learn baking, a home-grown joint can tempt many cannabis aficionados into becoming growers. 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