In article ,
Owdboggy wrote:

C. europeaum is a discontinued name for either C purpurascens (which is
not hardy) and C.repandum forms.

It's certainly not hardy in Caithness, I agree! But, given that it
has naturalised in a dozen or so locations in England and Wales,
there is a sense in which it has to be hardy.


Regards,
Nick Maclaren.