Paradox
Marine Bonsologist
I'm in 7a.Denmark and other parts of (true) Scandinavia have a funny climate, though. Quite North in latitude, but right on a warm current coastline. Same with Pacific US and Canada. Look at a winter hardiness zone and to all the way North towards Alaska. Lots zone zone 7 and 8s. Then look at a Daily Light Integral map. You have these areas with a strange mixture of very mild winters, but quite low Daily Light Integrals. Try to grow a tree in those places, that wants full sun in say Central Japan. Or Maryland/Virginia, or France/Northern Italy. If you then also have just 2 to 3 hours of morning sun. Even for Japanese maple trees, I think they require full sun, right? Just not full sun in a hot dry climate.
My maples get morning sun (4-5 hours) and afternoon shade during the hottest part of the day. Seems to be the only way to prevent getting sun scorched.