Growing Buddleia in zone 4/5

Well, I'm pushing the envelope on this one, but I've decided to give buddleia
a try in my Ottawa garden.  I'm growing a "mix" of varieties from seed so if
the experiment fails, it won't have been a costly one!  If they bloom first
year, I'll get at least 1 bloom season out of them.

I'm planning to plant them out in large containers.  The question is: where
should I overwinter them?  I have an unheated garden shed which will offer
some protection, but will still be cold.  I was thinking of wrapping the
containers in burlap or something for extra insulation.  I don't have any
semi-heated location (no attached garage). The only other alternative would be
to bring it in for the winter.  I don't know how they'll feel about being kept
in warm conditions all winter.  

Any suggestions?

-Sheila
Zone 4/5
Ottawa, Canada

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