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If you’ve noticed crusty, leafy, or even beard-like growths on your trees and shrubs, you might have wondered if they\u2019re harmful \u2014 perhaps a type of fungus or mold. The good news? These curious growths, known as\u00a0lichens, are\u00a0not\u00a0harmful to your trees. In fact, they’re a fascinating and entirely natural part of the ecosystem, and understanding them can help you better care for your garden and landscape.<\/p>\n
Although they may resemble fungi at first glance, lichens are\u00a0not\u00a0fungi, mold, or a disease. Instead, a lichen is a\u00a0symbiotic partnership\u00a0between a\u00a0fungus\u00a0and a\u00a0photosynthetic organism\u00a0\u2014 usually a green\u00a0alga\u00a0or a\u00a0cyanobacterium. Sometimes, both are present. These two (or sometimes three) organisms work together to form what we see as a single growth.<\/p>\n
This partnership allows lichens to live in all kinds of places, including your tree bark. But here’s the key point:\u00a0lichens do not feed on or harm trees. They use the bark only as a surface to grow on \u2014 not as a food source.<\/p>\n
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At our nursery, one of the most common questions we hear is: “Is that a fungus hurting my tree?” It\u2019s a fair question \u2014 lichens can look unusual, and many people associate them with decay or disease. But lichens:<\/p>\n
They are\u00a0not parasitic, and their presence is not a sign that your tree is sick. In fact, they often grow on healthy trees, especially older ones with textured bark and good air circulation.<\/p>\n
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Lichens come in many shapes and colors. You might see:<\/p>\n
They can be green, gray, yellow, blue, or even orange. This variety often leads to confusion with mold or mildew, but unlike those, lichens are not a sign of moisture problems or decay.<\/p>\n
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Lichens grow where conditions are right \u2014 and that usually means a stable surface with enough light and moisture. Trees, especially those with rough bark and plenty of sunlight on their trunks and branches, provide ideal real estate. Factors that promote lichen growth include:<\/p>\n
Ironically, the presence of lichens can be a sign of a\u00a0healthy environment!<\/p>\n
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No \u2014 in almost every case, lichens are\u00a0harmless. They don\u2019t affect the tree\u2019s growth, bark, or leaves. However, they may become more noticeable if a tree is already under stress or in decline (for example, losing leaves or bark). In these cases, lichens might appear to spread more quickly simply because they have less competition for light and space \u2014 but they are not the cause of the problem.<\/p>\n
If you’re concerned about your tree’s health, it’s a good idea to have it evaluated by an arborist or horticulturist. But rest assured:\u00a0lichens alone are not a reason to worry.<\/p>\n
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Generally, there\u2019s no need to remove lichens from your trees. They don\u2019t harm the bark or hinder growth. Attempting to scrub or scrape them off can damage the tree\u2019s protective outer layer. If lichens bother you for aesthetic reasons, you can try these gentle approaches:<\/p>\n
But overall, we recommend\u00a0leaving them be. They\u2019re part of a healthy, living landscape.<\/p>\n
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Beyond being harmless, lichens are actually\u00a0incredible organisms. They are some of the oldest and toughest life forms on Earth, capable of surviving in extreme environments \u2014 from mountaintops and deserts to city sidewalks. They:<\/p>\n
Scientists even study lichens for insights into environmental changes, climate shifts, and more. Having them on your trees can be a sign that your local ecosystem is thriving.<\/p>\n
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At our plant nursery, we believe in celebrating the many small wonders that nature brings to our gardens \u2014 and lichens are one of them. They may look unfamiliar or even worrisome at first, but now you know:\u00a0lichens are not mold, not fungi, and not a threat to your trees.<\/p>\n
Instead, they\u2019re an example of how life finds a way to flourish in partnership. So the next time you spot a patch of lichen on your favorite tree, take a moment to appreciate this little marvel of nature. It’s been there quietly doing its thing \u2014 enriching your garden\u2019s biodiversity, and asking nothing in return.<\/p>\n
Have questions about your trees, shrubs, or anything else growing in your yard? Feel free to stop by or contact us \u2014 we\u2019re always happy to help you grow with confidence!<\/p>\n
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If you’ve noticed crusty, leafy, or even beard-like growths on your trees and shrubs, you might have wondered if they\u2019re harmful \u2014 perhaps a type of fungus or mold. The good news? These curious growths, known as\u00a0lichens, are\u00a0not\u00a0harmful to your trees. In fact, they’re a fascinating and entirely natural part of the ecosystem, and understanding […]<\/p>\n","protected":false},"author":348,"featured_media":63708,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[103,40,1180,54],"tags":[],"class_list":["post-63707","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-landscaping","category-gardening","category-newbie-gardener","category-trees-shrubs"],"acf":[],"_links":{"self":[{"href":"https:\/\/platthillnursery.com\/wp-json\/wp\/v2\/posts\/63707","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/platthillnursery.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/platthillnursery.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/platthillnursery.com\/wp-json\/wp\/v2\/users\/348"}],"replies":[{"embeddable":true,"href":"https:\/\/platthillnursery.com\/wp-json\/wp\/v2\/comments?post=63707"}],"version-history":[{"count":0,"href":"https:\/\/platthillnursery.com\/wp-json\/wp\/v2\/posts\/63707\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/platthillnursery.com\/wp-json\/wp\/v2\/media\/63708"}],"wp:attachment":[{"href":"https:\/\/platthillnursery.com\/wp-json\/wp\/v2\/media?parent=63707"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/platthillnursery.com\/wp-json\/wp\/v2\/categories?post=63707"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/platthillnursery.com\/wp-json\/wp\/v2\/tags?post=63707"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}