"JennyC" wrote

Mine have been outside in winters of -15 and been OK :~)

Some Americans say they can't take frost, strange isn't it how the same
plant can take a frost here but not in the States. Maybe it's that we
usually get intermittent frosts, frost at night but above freezing during
the day, or they only last a couple of days, whereas they can get frosts
that last for weeks, day and night.
Another example of our Maritime type climate against their Continental type
climate perhaps.

--
Regards
Bob Hobden
17mls W. of London.UK