Canna's

Can I seek the collective wisdom of the list about these admirable plants?
As I thought I understood it, there were two main species - C*generalis and
C*orchioides. But there now seem to be such a bewildering array of interbred
cultivars that I guess this is distinction has been lost. 

Here in the UK they are primarily grown as greenhouse and conservatory
specimens or lifted from outside in late autumn before bedding out again in
the spring. But I wonder if any of the interbred, recent additions are more
hardy than the originals and likely to survive being left in the ground to
overwinter in the coastal maritime climate of SW England? 

The area is not frost-free in most winters but any that do occur are
unlikely to be more than a few (2-3) degrees below zero and infrequent at
that.

Thank you for any advice. 

Tristram (from the UK where the sun is seen this summer more rarely than
Osama bin Laden)
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