• 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?

American Indians use traditional ignition methods on a prescribed fire project

The indigenous people of Yosemite Valley have used fire as a tool for thousands of years. Fire was used to encourage the growth of plants used for basket making and to promote the growth of the black oak--a sun loving species--and a staple food source for American Indians from this region.