It is hardy to -10C @Kate 7 but does need a sunny, sell-drained position. You could try growing it in a pot and moving it to shelter in winter or else take cuttings as insurance.
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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When you don't even know who's in the team
S.Yorkshire/Derbyshire border
My sister grows it like a weed in Dorset.
Thanks for replies