Hardiness of Dianthus Fenbow (nutmeg clove)

Albany, ME(Zone 4b)

I ordered some Dianthus Fenbow seeds from Thompson and Morgan and then noticed that they were rated for zone 7-10. Everywhere else they're rated 4-10. Including Dave's Garden. I sent a query to T & M pointing out the discrepancy and asking for an explanation. Their response is below. Dianthus Fenbow is a very old variety. I can't imagine that some are hardier than others. Any thoughts?

TIA
LAS

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Dear Laurel,

Thank you for your email. I apologize for the inconvenience. The Dianthus - Fenbow Nutmeg Clove is hardy for zone 7-10.

I'm enclosing an information sheet for your review.

If we can be of further assistance, please feel free to contact us.

Sincerely,

Elisa
Customer Service

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