This discussion lead to (re)do some research and found some hype sites,
but if I go to http://www.paulownia.org/ I do find a listing of mills at
http://www.paulownia.org/directory.html#mill

I also noted an Ausy web-site that noted that Paulownia grown in warmer
climes is not suitable for lumber, as it grows too fast/soft. While
cooler climes is better.

Just guessing on what they meant in climes, I would guess that "cooler"
would include most of the USA

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