Wow. It doesn't sound like these would survive in a container bog garden at all. i have no garage to move it to and no way to protect it from continuous freeze/thaw cycles.
I do believe I'll stay with the refrigerator technique.
Thanks everyone for your input.
Hi:
I am looking to buy a few S. purpurea. Do these plants survive total freezing in a situation where the bog might be frozen for a while, then unfreeze, then refreeze all winter long?
If so, how do they survive or do they have some sort of antifreeze?
Even the hardiest type of purps can only survive one freeze. Ours was doin great until the second...