Okay, here's the situation: our fruit trees, which weren't great to begin with, have gradually succumbed to some disease or another that grows tumors all over them. So I'm ready to chainsaw the old ones for BBQ wood, and replant.

I've found some dwarf cherry trees for sale that look healthy: Dwarf Black Tartarian, and Dwarf North Star. Is there anything good or bad to be said about those? They're about 6' tall at the moment. Is it still a time to plant them?

The yard is in zone 5b, has less than fantastic soil (lots of clay, doesn't drain very well), and I'm a bit out of my depth with trees (my experience is mainly with herbs). I could use any advice you'd offer on the subject.

Thank you!