Very nice pics. You live in one of the mildest areas of Norway, I know. Also I know Soer Hidle. Also Heligoland, the red island in the North Sea, has the winter mildest area of Germany, USDA zone 9a. You also live in USDA zone 9a, I believe that. You also have the similar possiblities to outplant the same exotics like on Heligoland.
One friend, he is biologist and scientist, and I initated one palm project on Heligoland, more look at http://www.helgopalmen.com
(German and English version), it runs since 2003. Even one Aloe arborescens has already survived 2 winters without winterprotection and bloomed every year on Heligoland!
I self have also bananas in my garden, I will make photos in the next days and will open one gallery here and will show them you then.
Happy banana growing