Updated: February 28, 2023
  • A burl is a large woody, rounded swelling, usually found on a tree trunk.
  • "Burl wood" is prized for its unusual grain pattern. The grain of the wood swirls around each bud trace, forming interesting patterns in the wood.
  • The cause of most burls cannot be explained.
  • They may develop as a result of insects, bacteria, fungi, mistletoes, or environmental injury, such as freeze damage.
  • Sprouts arising from the burl may be pruned off, otherwise, no treatment is necessary.
  • Removal of the burl may damage the tree and is not recommended.
Burls on tree
Burls can obtain a diameter of up to 3 feet and may have many buds or sprouts