I was asked if it is possible to grow papaws (Asimina triloba) in Norway. I don’t think it’s impossible, but I suspect they need warmer summers than most parts of Norway can offer. I have seen good size trees in Malmø (Southern Sweden) with one fruit at the end of July in Åke Truedssons garden and a good size tree in the Gøteborg Botanical, pictures in both sites are from 29th-30th July 2008. I don’t know how these trees are doing today. I’ve tried a couple of times. I’ve managed to germinate seed, but the plants hardly grow in my cold summers! See more about papaw (which is not the same as the better known tropical pawpaw or papaya) on the wiki page here: https://en.wikipedia.org/wiki/Asimina_triloba
1) In Åke Truedsson’s garden in Malmø with a fruit!