Occluded Branch Stub

In lumber, occlusion refers to a process by which the wood fibers around a branch or other defect grow together and close off the defect. When a branch is cut or otherwise removed from a tree, the tree responds by growing new wood around the site of the injury. If the new wood grows tightly around the defect, it can eventually close off the opening and create a smooth, continuous surface in the wood.

Occlusion is a natural process that can occur in both hardwood and softwood trees. It typically takes several years for occlusion to occur, as the new wood grows and gradually fills in the space left by the removed branch or other defect. The resulting wood grain around the occlusion may be slightly different than the surrounding wood, but it is generally strong and stable.