Planting iris in pots.

What happens if iris are planted in pots and brought indoors for the winter?
 I live in Illinois where frosts are just starting.  I have a few dormant
rhizomes that I would like to put in the ground but, I'm wondering how they
 would do if I put them in pots instead and kept them all winter indoors.
 Could I put them out in April and would they bloom??  Do they need the cold
of winter to bloom next year???

Also..how long can I keep a dormant rhizome?  Would it stay until planted
next spring?  I don't plan on keeping them until spring but I just wondered?

Gayla
East Peoria, Il ]
Beautiful crisp morning
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