{"id":5645,"date":"2026-06-08T09:39:09","date_gmt":"2026-06-08T08:39:09","guid":{"rendered":"https:\/\/www.gardenbenches.com\/blog\/?p=5645"},"modified":"2026-06-08T13:45:57","modified_gmt":"2026-06-08T12:45:57","slug":"mould-black-spots-teak-garden-furniture","status":"publish","type":"post","link":"https:\/\/www.gardenbenches.com\/blog\/mould-black-spots-teak-garden-furniture\/","title":{"rendered":"Mould and Black Spots on Teak Garden Furniture: Causes, Prevention and How to Remove Them"},"content":{"rendered":"\n<p>Finding black spots or mould on your teak garden furniture can feel alarming, especially if the furniture is relatively new. The good news is that this is a surface issue, not a structural one, and it is entirely fixable with the right approach.<\/p>\n\n\n\n<p>At <a href=\"https:\/\/www.gardenbenches.com\/\">Sloane and Sons<\/a>, this is one of the care questions we receive most often, particularly in spring when furniture has been sitting outside through a wet British winter. Here is everything you need to know about what causes it, how to remove it, and how to stop it coming back.<\/p>\n\n\n<div class=\"wp-block-ub-table-of-contents-block ub_table-of-contents\" id=\"ub_table-of-contents-ecfcf7b4-fb48-4e79-97b9-a7a9a1d8034e\" data-linktodivider=\"false\" data-showtext=\"show\" data-hidetext=\"hide\" data-scrolltype=\"auto\" data-enablesmoothscroll=\"false\" data-initiallyhideonmobile=\"false\" data-initiallyshow=\"true\"><div class=\"ub_table-of-contents-header-container\" style=\"background-color: #000000; color: #ffffff; \">\n\t\t\t<div class=\"ub_table-of-contents-header\" style=\"text-align: left; \">\n\t\t\t\t<div class=\"ub_table-of-contents-title\">In this article:<\/div>\n\t\t\t\t\n\t\t\t<\/div>\n\t\t<\/div><div class=\"ub_table-of-contents-extra-container\" style=\"\">\n\t\t\t<div class=\"ub_table-of-contents-container ub_table-of-contents-1-column \">\n\t\t\t\t<ul style=\"\"><li style=\"\"><a href=\"https:\/\/www.gardenbenches.com\/blog\/mould-black-spots-teak-garden-furniture\/#0-what-are-the-black-spots-on-teak\" style=\"\">What Are the Black Spots on Teak?<\/a><\/li><li style=\"\"><a href=\"https:\/\/www.gardenbenches.com\/blog\/mould-black-spots-teak-garden-furniture\/#1-what-causes-mould-on-teak-garden-furniture\" style=\"\">What Causes Mould on Teak Garden Furniture?<\/a><\/li><li style=\"\"><a href=\"https:\/\/www.gardenbenches.com\/blog\/mould-black-spots-teak-garden-furniture\/#2-how-to-remove-mould-and-black-spots-from-teak\" style=\"\">How to Remove Mould and Black Spots from Teak<\/a><\/li><li style=\"\"><a href=\"https:\/\/www.gardenbenches.com\/blog\/mould-black-spots-teak-garden-furniture\/#3-what-if-the-black-spots-do-not-come-off\" style=\"\">What If the Black Spots Do Not Come Off?<\/a><\/li><li style=\"\"><a href=\"https:\/\/www.gardenbenches.com\/blog\/mould-black-spots-teak-garden-furniture\/#4-how-to-prevent-mould-coming-back\" style=\"\">How to Prevent Mould Coming Back<\/a><\/li><li style=\"\"><a href=\"https:\/\/www.gardenbenches.com\/blog\/mould-black-spots-teak-garden-furniture\/#5-browse-teak-furniture-and-care-accessories\" style=\"\">Browse Teak Furniture and Care Accessories<\/a><\/li><\/ul>\n\t\t\t<\/div>\n\t\t<\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"0-what-are-the-black-spots-on-teak\">What Are the Black Spots on Teak?<\/h2>\n\n\n\n<p>The dark spots that appear on teak garden furniture are almost always one of two things: surface mould or tannin deposits.<\/p>\n\n\n\n<p><strong>Surface mould<\/strong> develops when moisture sits on wood for extended periods, particularly in shaded, low-airflow positions. It appears as dark grey or black patches, sometimes with a slightly fuzzy surface texture. It is more common on furniture left under trees, in corners, or in gardens that stay damp for weeks at a time.<\/p>\n\n\n\n<p><strong>Tannin deposits<\/strong> are a slightly different issue. Teak naturally contains tannins, which are part of what makes it such a durable outdoor wood. When teak gets wet, tannins can leach to the surface and oxidise, leaving dark staining. This is particularly common on new furniture in its first outdoor season.<\/p>\n\n\n\n<p>Both are cosmetic rather than structural. Neither indicates that your teak is low quality or damaged in any lasting way.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/www.gardenbenches.com\/blog\/wp-content\/uploads\/2026\/06\/MouldandBlackSpots2-1024x683.png\" alt=\"\" class=\"wp-image-5648\" srcset=\"https:\/\/www.gardenbenches.com\/blog\/wp-content\/uploads\/2026\/06\/MouldandBlackSpots2-1024x683.png 1024w, https:\/\/www.gardenbenches.com\/blog\/wp-content\/uploads\/2026\/06\/MouldandBlackSpots2-300x200.png 300w, https:\/\/www.gardenbenches.com\/blog\/wp-content\/uploads\/2026\/06\/MouldandBlackSpots2-768x512.png 768w, https:\/\/www.gardenbenches.com\/blog\/wp-content\/uploads\/2026\/06\/MouldandBlackSpots2.png 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"1-what-causes-mould-on-teak-garden-furniture\"><br>What Causes Mould on Teak Garden Furniture?<\/h2>\n\n\n\n<p>Mould needs three things: moisture, warmth, and organic matter. In a garden setting, all three tend to be present.<\/p>\n\n\n\n<p>The most common contributing factors are:<\/p>\n\n\n\n<p><strong>Shade and poor airflow.<\/strong> Furniture positioned in a shaded spot or against a wall dries slowly after rain. Extended surface moisture is the primary driver of mould growth.<\/p>\n\n\n\n<p><strong>Fallen leaves and debris.<\/strong> Organic material trapped against or under furniture creates a perfect environment for mould. This is particularly relevant for benches positioned under or near deciduous trees.<\/p>\n\n\n\n<p><strong>Lack of cleaning.<\/strong> Pollen, algae, and general organic debris build up on surfaces over time. Without occasional cleaning, these create conditions that allow mould to take hold.<\/p>\n\n\n\n<p><strong>Moisture trapped under covers.<\/strong> Poorly fitted or fully waterproof covers that trap moisture rather than allowing airflow can paradoxically make mould worse. Breathable covers are always preferable; see our guide on <a href=\"https:\/\/www.gardenbenches.com\/blog\/do-you-need-covers-for-teak-garden-furniture\">garden furniture covers for teak owners<\/a> for more details.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"2-how-to-remove-mould-and-black-spots-from-teak\">How to Remove Mould and Black Spots from Teak<\/h2>\n\n\n\n<p>For most surface mould and black spot issues, a thorough clean is all that is needed.<\/p>\n\n\n\n<p><strong>Step one: Brush off loose debris.<\/strong> Use a stiff brush to remove any loose dirt, algae, or surface mould before applying any liquid. Brushing dry rather than wet prevents the spread of contamination across the surface.<\/p>\n\n\n\n<p><strong>Step two: Apply a teak cleaner or mild cleaning solution.<\/strong> For light mould, warm water with a small amount of washing-up liquid, applied with a stiff-bristled brush, works well. Work along the grain of the wood rather than across it to avoid raising the grain unnecessarily.<\/p>\n\n\n\n<p>For more stubborn black spots or established mould, a dedicated teak cleaner will be more effective. These are formulated to break down the compounds in mould and tannin staining without damaging the wood.<\/p>\n\n\n\n<p><strong>Step three: Rinse thoroughly.<\/strong> Rinse the furniture well with clean water to remove all cleaning product residue. Leaving soap or cleaner on the surface can attract dirt and promote further mould growth.<\/p>\n\n\n\n<p><strong>Step four: Allow to dry completely.<\/strong> Before oiling or applying any treatment, the furniture must be fully dry. In UK spring and autumn, this may take 24 to 48 hours.<\/p>\n\n\n\n<p>Our guide on <a href=\"https:\/\/www.gardenbenches.com\/blog\/how-to-clean-teak-wood-indoor-furniture\/\">how to clean teak wood outdoor furniture<\/a> covers the cleaning process in more detail, including the tools and products that work best.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"3-what-if-the-black-spots-do-not-come-off\">What If the Black Spots Do Not Come Off?<\/h2>\n\n\n\n<p>If standard cleaning does not fully remove the staining, the next step is a light sanding. Fine-grit sandpaper (120 to 180 grit) used along the grain will remove the surface layer where the mould or tannin deposit has penetrated, exposing fresh wood beneath.<\/p>\n\n\n\n<p>After sanding, clean off any dust and allow it to dry before deciding whether to oil. If you want to restore the original honey colour, oiling after sanding gives the best result. Our article on <a href=\"https:\/\/www.gardenbenches.com\/blog\/restore-teak-furniture\/\">how to restore teak furniture<\/a> walks through the full restoration process for pieces that have weathered significantly or developed heavy staining.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"4-how-to-prevent-mould-coming-back\">How to Prevent Mould Coming Back<\/h2>\n\n\n\n<p>Prevention is considerably easier than treatment. A few simple habits will significantly reduce the likelihood of mould and black spots developing.<\/p>\n\n\n\n<p><strong>Clean the furniture at least once a year.<\/strong> A thorough clean in autumn before the wet weather sets in, and a lighter clean in spring, removes the organic material that mould needs to develop.<\/p>\n\n\n\n<p><strong>Improve airflow around the furniture.<\/strong> If possible, avoid positioning benches and dining sets in permanently shaded spots or tight against walls. Even a few centimetres of clearance from a wall makes a difference to how quickly furniture dries after rain.<\/p>\n\n\n\n<p><strong>Clear debris regularly.<\/strong> If your garden has trees nearby, make a habit of brushing leaves and organic matter off garden furniture rather than letting it accumulate.<\/p>\n\n\n\n<p><strong>Use breathable covers in winter.<\/strong> A good-quality, breathable cover during the wetter months protects against debris and reduces moisture buildup without creating a sealed, damp environment. Browse our <a href=\"https:\/\/www.gardenbenches.com\/accessories\/garden-bench-covers\">garden bench covers<\/a> range for options sized to fit standard bench and dining furniture.<\/p>\n\n\n\n<p><strong>Treat with teak oil occasionally.<\/strong> A clean, oiled surface is somewhat more resistant to mould than bare grey teak because it leaves less for mould spores to grip onto. This is not a reason to oil on its own, but it is an additional benefit if you are already oiling for cosmetic reasons.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"5-browse-teak-furniture-and-care-accessories\">Browse Teak Furniture and Care Accessories<\/h2>\n\n\n\n<p>You can find our full range of <a href=\"https:\/\/www.gardenbenches.com\/outdoor-teak-dining-furniture\">outdoor teak dining furniture<\/a> and <a href=\"https:\/\/www.gardenbenches.com\/wooden-benches\">wooden garden benches<\/a> on the Sloane and Sons website, alongside care guides and maintenance advice designed to help your furniture last for decades.<\/p>\n\n\n\n<p>For related reading, our articles on <a href=\"https:\/\/www.gardenbenches.com\/blog\/why-teak-turns-grey\/\">why teak turns grey<\/a> and <a href=\"https:\/\/www.gardenbenches.com\/blog\/restore-teak-furniture\/\">how to restore teak furniture<\/a> cover the broader picture of teak weathering and care.<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Finding black spots or mould on your teak garden furniture can feel alarming, especially if the furniture is relatively new. The good news is that this is a surface issue, not a structural one, and it is entirely fixable with the right approach. At Sloane and Sons, this is one of the care questions we [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":5647,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_eb_attr":"","ub_ctt_via":"","footnotes":""},"categories":[64,5,60,61],"tags":[],"class_list":["post-5645","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-furniture","category-gardening-tips","category-lifestyle","category-maintenance"],"acf":[],"featured_image_src":"https:\/\/www.gardenbenches.com\/blog\/wp-content\/uploads\/2026\/06\/MouldandBlackSpots.png","author_info":{"display_name":"Garden Benches","author_link":"https:\/\/www.gardenbenches.com\/blog\/author\/garden-benches\/"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to Remove Mould from Teak Garden Furniture<\/title>\n<meta name=\"description\" content=\"Black spots and mould on teak furniture? 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