What is this woody growth on the limbs of this gum tree? It doesn't seem to harm the tree which has been growing well for about 5 years now. Any help appreciated. And, is it harmful to surrounding trees?
woody growth
Nothing is wrong with the tree. These are known as 'corky extrusions' according to this article.
http://www.walterreeves.com/gardening-q-and-a/sweetgum-wings-on-twigs/
And mentioned here with a picture at the bottom of the article.
http://www.uky.edu/hort/Sweetgum
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