exfed I haven't done this on purpose, but I did have some left over rhizomes in a bag in the basement over winter. In the spring they still had a bit of green to them, and I'm sure they would have survived had I planted them. I doubt if they would have bloomed for a couple of years, but they would have lived. Another alternative is to plant one of each in a large pot and bury the pot over winter outside. Then in the spring, dig a hole and pop them in. You have a better chance of them blooming in the spring then. In your zone you might get by with it best if you dig them in mid November, and then plant them in March, or as early as you can. Good luck and keep us posted on the results!
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