Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous > Ironwood (Ostrya) > Unusual growths on trunk or branches
Ironwood (Ostrya) > Trunk/branches > Unusual growths on trunk or branches
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Burls
- Large round to semi-circular swellings along main trunk or large branches
- Many buds or sprouts may be present on the exterior of the burl
- Also common on maples
- Burls continue to grow as the tree grows
- While burls do not kill trees directly they can reduce a tree's health and lifespan
- There is no known cause for burls
- More information on Burls
