Over-wintering pelagoniums in damp, frost-free Cornwall

I have several thriving pelagoniums acquired this year from cutting
from my mother, and this will be their first winter. I have read great deal of advice on overwintering indoors or in a glasshouse. have also noticed that alot of people leave theirs planted in thei gardens down here. Any advice from others living in damp, frost-fre (most of the time) West Cornwall woud be appreciated.
-- TriciaMcCartney
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