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Hibiscus question

This week I bought a potted hibiscus.  The lady in the store told me that I
could put it outside in the spring(in a patio pot) and it would thrive all
summer, bringing it back inside before the first frost.  Once home, I
researched a bit more and found that hibiscus can be hardy to -28 degrees C,
which would make it hardy enough to stay out all winter. (Ontario, Canada,
Zone5)  How do I tell if my hibiscus is the "winter outdoors" type?  Has
anyone left theirs out in these conditions?

Angela
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