BurlsPosted on January 19, 2015 Updated: January 30, 2015 by Jason Gordon Burl on oak. Sturgis, MS A burl is a deformed tree growth. It is commonly found in the form of a rounded outgrowth on the trunk or branch and is filled with knots from dormant buds. It is often formed by some kind of stress, such as a mechanical injury, virus, or fungus.
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