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What Is a Tree Burl?
A tree burl is most common in the redwood species but can form on any woody plant. The burl forms at the base of the tree where buds or shoots, sometimes called suckers, form from the original tree. Under normal conditions, the shoots don't extend from... More »
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en.wikipedia.org/wiki/Burl

A burl (American English) or bur or burr (UK English) is a tree growth in which the grain has grown in a deformed manner. It is commonly found in the form of a rounded outgrowth on a tree trunk or branch that is filled with small knots from dormant buds.

northernwoodlands.org/outside_story/article/go-figure-how-tree-burls-grow

May 11, 2015 ... I've had my eye on this maple in my woods for some time. Not because it's a beautiful timber tree. It's only about eight inches in diameter, after all. But, it has an interesting burl about 14 feet up the trunk. As a woodturner, I love the twisted wood grain found in most burls. A burl is a surprise package on a tree.

wonderopolis.org/wonder/what-is-a-burl

Sep 12, 2016 ... Burls on redwood trees, for example, can grow large enough for new trees to sprout from! Scientists believe burls have probably been around as long as trees themselves. Yet, despite this long history, scientists are still not sure exactly what causes them to form. They do have several theories, though.

www.thoughtco.com/what-is-a-tree-burl-1342918

Jun 4, 2017 ... Burl-Like Symptoms. These tree trunk infections called "burls" look like bumps or warty growths probably caused as a result of environmental injury. Cambial growth is hyper-stimulated as a way for the tree to isolate and contain the injury. Almost all burl wood is covered by bark, even when underground.

hunskihardwoods.com/burl-wood

These are the most commonly asked questions about burl. A burl is a tree growth in which the grain has grown in a deformed manner. It is usually found on the trunk, at the base of the tree, and sometimes underground in the form of a rounded outgrowth. It is caused by some kind of stress, such as injury, virus, fungus, insect ...

www.enchantedburl.com/About_Burl.html

Burls form as an outgrowth on the trunk of a tree and/or within the root system. It is interesting that burls have probably been around for as long as trees themselves, yet there is little consensus as to why they grow. They can grow into gigantic sizes, forming slowly along with the growth of the tree. Burls begin to be seen as it ...

uconnladybug.wordpress.com/2011/04/20/galls-burls-explained-sort-of

Apr 20, 2011 ... Galls and tumors can be any size or shape and may occur on both woody and herbaceous plants and plant parts. The swelling occurs as cells ... This relatively small burl from an apple tree (cause unknown) has an interesting surface pattern and interior grain showing bud traces. Burl from an apple tree ...

treehut.co/blogs/news/what-is-burl-wood-its-weirder-than-you-think

A burl is a cool-looking, extraneous growth on a tree. Ugly on the outside, but magnificent on the inside, it can form on any type of tree! A burl usually grows when the tree is undergoing some stress, whether it be an injury, virus, or fungal infection. The tree's growth hormones are disrupted and, consequently, it produces ...

www.nrs.fs.fed.us/pubs/jrnl/2012/nrs_2012_smith-k_002.pdf

Several tree wardens have recently reported thefts of burls from pubhc trees, especially m park areas. A burl is a tree growth in which the grain has grown in a de- formed manner. It commonly occurs on a tree trunk or branch as a rounded outgrowth filled with small knots. Several incidents have been reported to police, who.