What is the farthest North that anyone has seen Hibiscus Mutabilis grow ?

Chatham-Kent, ON(Zone 6a)

I would like to hear FROM EXPERIENCE how much cold it can possibly take . TIA :)

Jonesboro, GA(Zone 7b)

Don't know just how far North they live but my book says they are hardy in zones 9-7, I know there are lots of them around Atlanta.

Chatham-Kent, ON(Zone 6a)

I have tried them here before ( and failed ) so I think I need to find a hardier source ...I need THE one freak plant that has managed to survive /adapt where others have failed . Hibiscus coccineus , H.syriacus , and H. moscheutos all perform very well here .

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