Totally missed my window for here in Texas. Should I freeze the rhizomes? Will they survive a year of dormancy?
I'd go on and plant them. While it's a wee bit late for your zone, you'll still be alright. Just keep an eye on them and make sure they get plenty of water. Since they'll be getting planted a bit late, they won't have developed the root system needed to survive a hot Texas summer without you helping them out with plenty of extra water.
I don't think they'd survive a year in the freezer.
They won't thrive this year for sure, but helping them limp along in the garden until next year will be better than losing them completely.
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