Mine are with hostas and they are fine. In fact, they get covered in at least a foot of snow for six months of the year. When the snow melts, they are the first bit of green I see and THAT is the most encouraging thing for me. Our winters are so long and ninety percent of everything else dies off completely from the ground up, and it takes almost a month to see new shoots coming up out of the ground for most everything else. So, having the heucheras in the early spring is wonderful for me! I admit, we do have well draining soil here, so too much wet isn't an issue, even when the snow is melting. If I were you, I'd try a few for the first winter and add more if they survive.
