Thanks, Jo Ann!
At this point, Becky is leaning toward "I already have one hydrangea, and there is no room after we add the KO Roses".
I'm leaning toward "I can't bear to kill a healthy plant, so I'll find out if they can survive in 5 gallon plastic pots in my Zone 8b yard".
Hmm, "Search by Characteristics" doesn't seem to have an option for "minimum hardiness Zone N or higher".
Spot checking, I see one hydrangea that's hardy to Zone 6, and many with no hardiness listed.
Googling:
"The majority of hydrangeas tend to be warm weather plants.
They do best when temperatures remain above freezing year round."
"Most bigleaf hydrangeas thrive in zones 6 to 8"
Maybe I should move it to my sheltered porch during the winter.
Viburnum sounds plenty hardy.
