I planted in November last year. I used some of the wood shavings vendors use as packing material as insulation around the rhizomes. Just enough light got thru for growth. Then at night I covered them with small plastic tubs. I did this for about 4 weeks, Then I just stopped covering them but left the insulation. They did great. But the ones I put in pots did not do well at all. But it was my first attempt at overwintering in pots. So I'm sure that is the reason they did poorly.
Blessings
