• Rainbow over Half Dome

    Yosemite

    National Park California

Mather Musings: Burls

August 18, 2012 Posted by: AS - Mather District Interpretive Ranger

Burls

Burl

A burl is a rounded growth on the trunk or branch of a tree. This specialized deformity is a result of stress and abnormal growth in the grain of wood. Injury, virus and fungus can all cause burls. They are usually covered in bark and do not hurt the tree unless the weight of the tree causes breakage. Many trees have a burl underground and the burl remains undiscovered until the tree is uprooted.

mather musings




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Did You Know?

Low intensity fire in Yosemite

Natural fires in Yosemite are often no more than a single burning snag (standing dead tree) or a slow moving, low intensity fire that cleans underbrush from the forest floor. These fires prevent unwanted fires by removing accumulating forest debris that can fuel a larger fire in hot, dry conditions.