Dave
I just was forced to overwinter my entire Sarracenia collection (not big
but all species represented and several forms of each) outside. The
water was allowed to evaporate so theplantrs were damp at best. It
rained and then immediately froze so every Sarracenia was standing in
two inches of rock solid ice and the actual soil also froze solid.
Temperatures were about -6C forabout 3-4 days and then hovered around 0C
for weeks.
I've now brought most in and all survived.
I'm NOT advising Sarracenias should be overwintered outdoors but all of
them seem able to withstand some severe frosting. Obviously S. fava
andS. purpurea do best as these grow well into Canada where winter is
really severe.
Incidentaly, I accidentally froze Cephalotus and U. subulata in exactly
the same way and they both survived with absolutely no damage
whatsoever!!!
Regards
paul