I grew N. ventricosa outside for a season or so, but it took
cold damage in the winter so this year I brought it back in.
It was pitchering outside however, and actually did better
than indoors under flourescents. Temps during the summer
varied between 80-90 F, and the plant survived winter temps
down to about 30 F. I have no idea what the humdity was,
but it`s never that high around here. Night humdity was
probably higher than day. My plant got direct sunlight for
maybe 2-3 hours a day, and solid diffuse sunlight for perhaps
another hour or two. Another grower I know grew the same
species just two blocks from where I live, and his plant
looked fantastic, but I don't know his growing conditions
other than that they were outside. This plant has a nice
waxy leaf which does well outside, along with N. fusca.
I've grown a very small N. fusca outdoors this winter and
it slowed down but continued growing and pitchering. On
the other hand my N. khasiana, with more delicate leaves,
seems to have suffered a bit from the colder temps.
Robert