Growing it in a pot... Hmmm... Maybe that's what I should do.
I have a small Nikko Blue which flowers pink if it flowers at all, which isn't every year. I planted it under the dripline of the center of three 100-foot-tall Norway Spruce trees. The other two trees have since blown down during a storm in '08. It's a sorta dry spot (competing with the tree for resources) and gets afternoon sun--not the best location, I'll admit, but in my own defense it was shady and moist when I first planted it. Still, it's also fairly well-protected by the tree in winter. Here in Z5a it dies down to the ground every year so I've started caging it in the fall and loading it up with dried leaves until spring.
So in my experience it's been a fairly delicate shrub which only grows to one meter, flowers poorly and lets me know that I should really have tested my soil before planting the poor thing so many years ago in spite of thinking that the soil would "of course" be acidic. It's a pretty pink, though.