Name: greene Savannah, GA (Sunset 28) (Zone 8b) I have no use for internet bullies!
I don't have an answer for you but I found a chart showing the climate in your area which may help others to give you a good answer. http://www.aland-islands.clima...
Sunset Zone 28, AHS Heat Zone 9, USDA zone 8b~"Leaf of Faith"
The lowest recorded winter temperature at Mariehamn is -26 degrees F. That would be equivalent to USDA Zone 4 in years where it got that low. On that basis the answer would usually be no for Hydrangea macrophylla.
Bit off track, but I have holidayed in Mariehamn. Lovely in summer.
Our friends, who live inland, don't have hydrangea but they do grow hellebores. Now on my mind is "Helan Gaer." Skael!
