I'm growing out a Nanking cherry in the ground. Bought it a few years ago as a small seedling, and after a few years of ground growing, I've managed to get a good 2-3" of trunk caliper on it. The grow strongly, more shrubby than tree like, with long straight branches. I had to chop it back this year because I was having work done on my porch, but it budded back very nicely.
It's an interesting variety. The bark is very dark, almost black, and the flowers and cherries are very tiny. They should make pretty nice shohin or maybe chuhin trees. Brent used to carry them, but I don't see them on his website anymore.