As Jerry mentioned, bees will use our black cottonwood if they happen to find a big hollow one.
I also saw a feral colony in a large western red cedar MANY years ago and in a hollow bigleaf maple.
Bee trees are not common here in NW Washington State though...
Dave.....
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Dave Pehling, Zoologist
WSU Extension Snohomish Co. (ret.)
600 128th St. SE
Everett, WA. 98208
http://snohomish.wsu.edu
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