> 
> >Obviously S. fava andS. purpurea 
> >do best as these grow well into Canada where winter is really >severe.
> 
> S. Flava grows in Canada?
> 
Well, no, not as part of it natural range, but it has been introduced to 
at least one Darlingtonia meadow in the medium-high Sierra Nevada of 
California (6,000 feet or so) and is apparently surviving...
... and when I find out who did that I'll give him a piece of my mind...
Sean Barry