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"They have very rot resistant timber and it makes great firewood."
You are kidding, right?
It may make OK firewood (?), but I would say at least 90% of the Robinia I have ever removed had extensive columnar decay, usually hidden from view, which makes them even scarier. I do not like them SamIam!
They do have nice flowers, though... The cultivar 'frisia' is said to be less invasive and more delicate, but I have seen and heard otherwise.
-Tom
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He is not kidding.
They are one of the BEST fence post species out there. I don't understand it either. As trees, they suck. Lots of dead and decay. As post, they are awesome, extremely long decay resistance. AND, i agree, one of the best firewood species out there for heat output.