{"id":3574,"date":"2018-05-25T06:00:38","date_gmt":"2018-05-25T13:00:38","guid":{"rendered":"http:\/\/gregalder.com\/yardposts\/?p=3574"},"modified":"2018-05-25T07:51:33","modified_gmt":"2018-05-25T14:51:33","slug":"keep-mulch-away-from-tree-trunks","status":"publish","type":"post","link":"https:\/\/gregalder.com\/yardposts\/keep-mulch-away-from-tree-trunks\/","title":{"rendered":"Keep mulch away from tree trunks?"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">When some people visit my yard or see photos of my trees, they spot a violation of the rules: Aren\u2019t you supposed to keep mulch away from the trunks of your trees?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">(That&#8217;s my rule-breaking lime tree in the photo above.)<\/span><\/p>\n<p><span style=\"font-weight: 400;\">It&#8217;s true, there\u2019s no real benefit to keeping mulch, such as leaves and wood chips, right next to the trunk of a tree. The main reasons to mulch are to prevent weeds, conserve soil moisture, and feed the life in the soil below. Little of that is needed right beside the trunk.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>No benefit but some risk<\/b><\/p>\n<p><span style=\"font-weight: 400;\">On the other hand, mulch touching the trunk has a potential negative consequence. I\u2019ll let this be stated by the University of California publication, <\/span><a href=\"http:\/\/anrcatalog.ucanr.edu\/pdf\/8048.pdf\"><span style=\"font-weight: 400;\">\u201cFruit Trees: Planting and Care of Young Trees.\u201d<\/span><\/a><span style=\"font-weight: 400;\"> It says, \u201cMulch should be kept several inches away from the trunk to minimize the occurrence of crown rot.\u201d<\/span><\/p>\n<p><span style=\"font-weight: 400;\">It\u2019s helpful here to learn more about crown rot. Then we can make sense of why this mulching \u201crule\u201d can be bent, of why I do bend it.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Crown rot is a disease said to be caused by the\u00a0<em>Armillaria mellea\u00a0<\/em>fungus\u00a0and especially different kinds of\u00a0<em>Phytophthora<\/em> fungi (actually, recently reclassified as oomycetes rather than fungi &#8212; but that\u2019s of no practical importance here). The symptoms of the disease can look like drought stress and can show as darkened, even oozing areas at the base of the trunk. (Read more at this UC Integrated Pest Management page, <\/span><a href=\"http:\/\/ipm.ucanr.edu\/PMG\/PESTNOTES\/pn74133.html\"><span style=\"font-weight: 400;\">\u201cPhytophthora Root and Crown Rot in the Garden.\u201c<\/span><\/a><span style=\"font-weight: 400;\">) <\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Why the risk?<\/b><\/p>\n<p><span style=\"font-weight: 400;\">But what\u2019s most important is to know why it\u2019s happening.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">It so happened that the other day I spoke with Pat Nolan, Plant Pathologist for San Diego County, and this topic was on my mind. So I asked her about the conditions needed for\u00a0crown rot<\/span><span style=\"font-weight: 400;\">. Constantly moist, she said.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">And so this is the reason for the advice to keep mulch away from trunks: Mulch retains moisture. This is a great thing when it\u2019s conserving moisture in the soil where the tree\u2019s roots are. It\u2019s dangerous when it\u2019s keeping the base of the trunk moist.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>It\u2019s all about the watering<\/b><\/p>\n<p><span style=\"font-weight: 400;\">When applying mulch, I never deliberately pile it up against the trunk. That\u2019s both wasteful and daring. But neither do I scrape it several inches away from the trunk. Not during application and not later. I just don\u2019t bother.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">I can get away with this for two reasons. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">One, I don\u2019t water my trees right at the base of the trunk &#8212; except during the first month for newly planted citrus or avocados. I apply water out near the edge of the tree\u2019s canopy. So the trunks of my trees stay generally dry because of this.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Two, I water as infrequently as possible. Remember, as Pat Nolan said, it\u2019s constant moisture that is required<\/span><span style=\"font-weight: 400;\">, not just any moisture at any one time. (Obviously! All trees get wet trunks during a heavy rain.) This is crucial because I use sprinklers and sometimes they get knocked and end up spraying the trunk for one or more irrigations. <\/span><\/p>\n<div class=\"mceTemp\"><\/div>\n<div id=\"attachment_3580\" style=\"width: 312px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/gregalder.com\/yardposts\/wp-content\/uploads\/2018\/05\/Lamb-avocado-tree-with-microsprinkler-and-mulch-touching-trunk.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-3580\" class=\" wp-image-3580\" src=\"https:\/\/gregalder.com\/yardposts\/wp-content\/uploads\/2018\/05\/Lamb-avocado-tree-with-microsprinkler-and-mulch-touching-trunk-225x300.jpg\" alt=\"Lamb avocado tree with microsprinkler and mulch touching trunk\" width=\"302\" height=\"403\" srcset=\"https:\/\/gregalder.com\/yardposts\/wp-content\/uploads\/2018\/05\/Lamb-avocado-tree-with-microsprinkler-and-mulch-touching-trunk-225x300.jpg 225w, https:\/\/gregalder.com\/yardposts\/wp-content\/uploads\/2018\/05\/Lamb-avocado-tree-with-microsprinkler-and-mulch-touching-trunk-600x800.jpg 600w, https:\/\/gregalder.com\/yardposts\/wp-content\/uploads\/2018\/05\/Lamb-avocado-tree-with-microsprinkler-and-mulch-touching-trunk-768x1024.jpg 768w, https:\/\/gregalder.com\/yardposts\/wp-content\/uploads\/2018\/05\/Lamb-avocado-tree-with-microsprinkler-and-mulch-touching-trunk-1080x1441.jpg 1080w, https:\/\/gregalder.com\/yardposts\/wp-content\/uploads\/2018\/05\/Lamb-avocado-tree-with-microsprinkler-and-mulch-touching-trunk.jpg 1300w\" sizes=\"(max-width: 302px) 100vw, 302px\" \/><\/a><p id=\"caption-attachment-3580\" class=\"wp-caption-text\">Lamb avocado tree with micro-sprinkler that has a deflective wedge aimed at trunk in order to keep trunk dry &#8212; dryish at least.<\/p><\/div>\n<p><span style=\"font-weight: 400;\">No big deal. As long as the irrigations are far enough apart such that the soil at the base of the trunk has dried out in between, <\/span><i><span style=\"font-weight: 400;\">Phytophthora<\/span><\/i><span style=\"font-weight: 400;\"> won\u2019t find the environment hospitable.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">If you use drip emitters on your trees, then make sure they are at least a foot away from the trunk &#8212; again, except for the first month or so after a new tree is planted.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>Take away<\/b><\/p>\n<p><span style=\"font-weight: 400;\">So what\u2019s the answer? Should we keep mulch away from tree trunks? Sure. But don\u2019t stress about it. The stress should be more on watering trees as infrequently as possible and watering them where they prefer to grow their roots, which is away from their trunks.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><b><i>You might also like to read my posts:<\/i><\/b><\/p>\n<h1><a href=\"https:\/\/gregalder.com\/yardposts\/growing-fruit-trees-in-southern-california\/\">Growing fruit trees in Southern California<\/a><\/h1>\n<h1><a href=\"https:\/\/gregalder.com\/yardposts\/get-your-hands-dirty-discover-the-truth-about-your-irrigation-practices\/\">Get your hands dirty: Discover the truth about your irrigation practices<\/a><\/h1>\n","protected":false},"excerpt":{"rendered":"<p>When some people visit my yard or see photos of my trees, they spot a violation of the rules: Aren\u2019t you supposed to keep mulch away from the trunks of your trees? (That&#8217;s my rule-breaking lime tree in the photo above.) It&#8217;s true, there\u2019s no real benefit to keeping mulch, such as leaves and wood [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":3578,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[31,33,32],"tags":[58],"class_list":["post-3574","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fruit-trees","category-soil-and-fertilizer","category-water-and-irrigation","tag-mulch"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Keep mulch away from tree trunks? - Greg Alder&#039;s Yard Posts: Southern California food gardening<\/title>\n<meta name=\"description\" content=\"Probably. 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Here\u2019s why, as well as how I know.","og_url":"https:\/\/gregalder.com\/yardposts\/keep-mulch-away-from-tree-trunks\/","og_site_name":"Greg Alder&#039;s Yard Posts: Southern California food gardening","article_published_time":"2018-05-25T13:00:38+00:00","article_modified_time":"2018-05-25T14:51:33+00:00","og_image":[{"width":1600,"height":1174,"url":"https:\/\/gregalder.com\/yardposts\/wp-content\/uploads\/2018\/05\/Bearss-lime-tree-mulch-touching-trunk.jpg","type":"image\/jpeg"}],"author":"Greg Alder","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Greg Alder","Est. reading time":"4 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/gregalder.com\/yardposts\/keep-mulch-away-from-tree-trunks\/#article","isPartOf":{"@id":"https:\/\/gregalder.com\/yardposts\/keep-mulch-away-from-tree-trunks\/"},"author":{"name":"Greg Alder","@id":"https:\/\/gregalder.com\/yardposts\/#\/schema\/person\/7c17362732023b01ed23dc69d6fa703a"},"headline":"Keep mulch away from tree trunks?","datePublished":"2018-05-25T13:00:38+00:00","dateModified":"2018-05-25T14:51:33+00:00","mainEntityOfPage":{"@id":"https:\/\/gregalder.com\/yardposts\/keep-mulch-away-from-tree-trunks\/"},"wordCount":720,"commentCount":20,"publisher":{"@id":"https:\/\/gregalder.com\/yardposts\/#\/schema\/person\/7c17362732023b01ed23dc69d6fa703a"},"image":{"@id":"https:\/\/gregalder.com\/yardposts\/keep-mulch-away-from-tree-trunks\/#primaryimage"},"thumbnailUrl":"https:\/\/gregalder.com\/yardposts\/wp-content\/uploads\/2018\/05\/Bearss-lime-tree-mulch-touching-trunk.jpg","keywords":["mulch"],"articleSection":["Fruit","Soil","Watering"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/gregalder.com\/yardposts\/keep-mulch-away-from-tree-trunks\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/gregalder.com\/yardposts\/keep-mulch-away-from-tree-trunks\/","url":"https:\/\/gregalder.com\/yardposts\/keep-mulch-away-from-tree-trunks\/","name":"Keep mulch away from tree trunks? - Greg Alder&#039;s Yard Posts: Southern California food gardening","isPartOf":{"@id":"https:\/\/gregalder.com\/yardposts\/#website"},"primaryImageOfPage":{"@id":"https:\/\/gregalder.com\/yardposts\/keep-mulch-away-from-tree-trunks\/#primaryimage"},"image":{"@id":"https:\/\/gregalder.com\/yardposts\/keep-mulch-away-from-tree-trunks\/#primaryimage"},"thumbnailUrl":"https:\/\/gregalder.com\/yardposts\/wp-content\/uploads\/2018\/05\/Bearss-lime-tree-mulch-touching-trunk.jpg","datePublished":"2018-05-25T13:00:38+00:00","dateModified":"2018-05-25T14:51:33+00:00","description":"Probably. But it's not something to worry about if you are watering a tree intelligently. 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