Jim Carlock wrote:
"Doug Kanter" mentioned:
Perhaps buddleia likes the humidity in Washington, and even if the
temps were identical all year to those in, say, upstate NY, it
would still want that humidity. Or something.

"Travis" explained from the rainforests of Washington and Vancouver:
We don't have what you would call humid weather.

g It's not humid. It just rains 9 out of 10 days of a week?

The rain forests are on the Olympic Peninsula.
http://www.nps.gov/olym/edurain.htm

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Travis in Shoreline (just North of Seattle) Washington
USDA Zone 8b
Sunset Zone 5