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Burls are woody growths that erupt from trees and are used by woodworkers and woodturners to create beautiful furniture and bowls.
Burl formation is typically a result of some form of stress such as an injury or a viral or fungal infection. Burls yield a very peculiar and highly figured wood sought after in woodworking, and some items may reach high prices on the wood market. Poaching of burl specimens and damaging the trees in the process poses a problem in some areas.
The tough lignotuber, or the burl, is valued for creating long-lasting and high quality charcoal when burned. The Kumeyaay also used chamise for making hardwood points of arrows. The chamise-wood point would be pressed or glued with pinyon pine pitch into a shaft made out of arrowweed , California sunflower , or mulefat .
On large trees these may become prominent burl-like bodies having several vertical or irregular folds in the callus covering. A single trunk canker near the base is a sign that the butt log is badly infected, and multiple cankers are evidence that the entire tree may be a cull.
Quercus macrocarpa is a large deciduous tree growing up to 30 metres (98 feet), rarely 50 m (160 ft), in height, [3] and is one of the most massive oaks with a trunk diameter of up to 3 m (10 ft).
Jarrah is a tree which sometimes grows to a height of up to 50 m (160 ft) with a diameter at breast height (DBH) of 3.5 m (11 ft), but more usually 40 m (130 ft) with a DBH of up to 2 m (6 ft 7 in). Less commonly it can be a small mallee to 3 m (9.8 ft) high. [ 8 ]
In the Olympic National Forest in Washington, Sitka spruce trees near the ocean sometimes develop burls. According to a guidebook entitled Olympic Peninsula, "Damage to the tip or the bud of a Sitka spruce causes the growth cells to divide more rapidly than normal to form this swelling or burl. Even though the burls may look menacing, they do ...
[6] [7] The wood from the narra tree and the Burmese padauk tree (P. macrocarpus) is marketed as amboyna when it has grown in the burl form. [8] The scientific name is Latinized Ancient Greek and means "wing fruit", referring to the unusual shape of the seed pods in this genus.