Understanding Corky Bark on Trees: A Natural Feature, Not a Disease

Seeing unusual, flat, corky growths along tree limbs can be unsettling, but in many cases this is simply a natural characteristic of certain species. Trees like sweetgum, winged elm, and bur oak develop prominent corky wings or ridges on their twigs and branches as they mature.

How to Identify Corky Bark

These growths are typically 1–2 inches wide, cork-like in texture, and appear as distinct ridges or wings running along the branches. They are firm, integrated into the bark, and do not peel off easily. This trait is genetic and poses no threat to the tree's health.

Confirming the Species

If you're unsure which tree you have, wait until spring when leaves emerge. Contact your local Georgia Forestry Commission office—they offer free on-site identification by a forester. Visit their contact page to find your county office.

No Treatment Needed

Corky bark is a normal morphological feature, not a pest or disease. The tree will not die from it, and no control measures are required. Simply enjoy the unique texture it adds to your landscape.