Hmmm...how cold are we talking about here? S. purpurea grows in some
locations in Iowa, where it can get up to 105 degrees in the summer, and
they deal with it. But S. minor and flava are not likely to take the
kind of winters that one finds in Canada and N. Minnesota - down to -30
or -40F. In Seattle we get cold snaps down to 6 or 7F every so often,
and Sarracenias are killed off if they get frozen. Certain species do
seem less hardy, especially S. minor and S. alata. S. leucophylla
surprisingly enough is hardier than some. But I don't believe they are
"equally cold hardy."
The greenhouse they were in probably
> helped contribute to the problem but all the other Sarracenia and
> southern purps were doing wonderfully there. My leucophylla (grown
> outside year-round in Northern Jersy) are set back; I think they are
> primed to start growing at a higher temp than S. flava, minor, oreo-
> phila, and most purpurea.
My S. orophila is always the first to pitcher here in Seattle, where
although the winters are usually not severe (average temp 40 degrees),
our spring is a long drawn out affair. Following is S. purpurea and
flava, then an alata x minor cross (strangely enough, this is open well
before either of the species). This is what is open now - S. alata is
still in the "red shoot" stage, and S. psittacina and S. minor are just
ahead of it. S. leucophylla is the last to open for me, though the
flowers are just starting now. I get a good crop of fall pitchers on it
but they come close enough to the fall frosts that they usually don't
catch much.
Bob