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You can plant up until the ground freezes and be sure to SOAK them in good... winterkill is simply dessication... Same with leaving them in pots...
I actually dig pots into the ground and then finish mulching over the top...
it is RISKY to let those pots freeze above ground surrounded only by mulch... placing them inside is probably the riskiest of all... afriend of mine tried the garage experiment with perennials and even they died b4 Spring made it...
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Well reasoned rational thought is the ONLY way to prove or disprove anything, rather than the foolish insults of those incapable of putting together the thought processes necessary to accomplish conclusions... 
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