When you got that junk in the trunk. A tree burl is a bulbous, woody growth often found on a tree trunk or branch. They are commonly seen in the form of a rounded outgrowth that is filled with small knots from dormant buds. Burl formation is typically a result of some form of stress such as an injury or fungal infection. The burl may continue growing for decades; during all that time, new, undeveloped bud tissue continues to build up in layers. As long as bark covers the exterior of the burl, the tissue is protected from any harm. Burls rarely cause harm to the tree. Image: Tree with burl growths on the side of its trunk mammothcavenps #trees #treetrunk #burls #wood #mammothcave #kentucky #forestlife