I just saw that you're in MN. To indirectly quote
@dyzzypyxxy, "Do it NOW!"
The hostas will surprise you in the spring when they start poking their heads up. And you never know what goes on underground - you might have a few more hostas than you did before!
I just looked up Wahoo. It's beautiful! And it can grow really big. Nice thing too is that if it has berries, the birds will be happy.
Be very careful about moving the ferns now. They will be dropping their leaves and will go dormant very soon if MN weather is what I'm thinking it is. Spring is usually the best time to transplant ferns, at least in my experience. If you don't have a bed prepped for them yet, you might consider potting them.
Not sure what you mean by 'the holes we make'.
A picture would be very nice.
