As you walk along the Brook Trail at Boyd Woods keep your eyes open to see if you can find this tree burl down by the brook. You have probably seen burls in various sizes and shapes at other times while out walking or hiking. A burl is a strange-looking collection of tree cells, which are called callus tissue.
Burls can be found on many trees, most often, on oaks, maples and cheery tress. Burls are not harmful to the tree. In fact, burls are prized by woodworkers for their beautiful patterns.
According to plant physiologists, “a burl is the result of hyperplasia, a greatly abnormal proliferation of xylem production by the vascular cambium. In other words, it is likely that some sort of infection by bacteria, viruses (yes, trees get viruses, too), fungi, or insects causes the tree to respond with highly irregular wood growth. The exact mechanism that causes burl formation is not fully understood. If it were, burls would probably be produced commercially for use by artisans.
Many landowners wonder if burls hurt trees or if they should have the tree cut down. There is little evidence to suggest that burls cause damage to trees. So, unless you are removing a tree with a burl for another reason, it is best to enjoy a burl for what it is—a bit of a mystery.
While you are out walking the trails at Boyd Woods Sanctuary see if you can find additional burls, and let us know where they are and your thoughts…does it look like a face?
Have FUN!