That doesn't bode well for overwintering it. I bring in the pallida and keep it in the garage. Even with a mulch covering it, sometimes winters here just have a cold spell that's too cold. That's in ground. In a container it would always be killed. It generally looks awful by the time I get it back outside in the spring. Most of the growth is allowed to weather and sunburn for a couple of days and then cut off each year. It grows back rapidly and looks good again. Spathacea will have to manage the same way. I don't have a greenhouse and I'm very neglectful of inside plants. Winter is tough unless the plant goes dormant.
