You should be fine down on the coast. i had one that survived winters down to -15C though it was sometimes slow to recover in spring. However they don't like it any colder than that and recent winters have been much worse so I lost mine several years ago and haven't replanted. I tried persicaria virginiana in a shady spot last year and it survived our winter very well - green leaves with a red V stripe.
Vendée - 20kms from Atlantic coast.
"The price good men (and women) pay for indifference to public affairs is to be ruled by evil men (and women)."
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You should be fine down on the coast. i had one that survived winters down to -15C though it was sometimes slow to recover in spring. However they don't like it any colder than that and recent winters have been much worse so I lost mine several years ago and haven't replanted. I tried persicaria virginiana in a shady spot last year and it survived our winter very well - green leaves with a red V stripe.