|How much humidity do highland neps need[/QUOTE]|
This is very much species dependent and variable. Take for example my N. truncata, which flowers every spring: I grow it as a house plant in my sun room. Winter humidity levels in January/February range from 20% - 30% and it does fine. The leaves are smaller, but the pitcher still atain their 12 to 15 inch size. In the summer I grow this plant in partial shade on my deck with no ill effect.
N. bicalcarata would not tolerate this. Its leaves are too thin in comparison to N. truncata and probably would not do very well.
N. ventricosa would probably do OK, but it would probably not pitcher.
When my N. clipeatas are bigger I plan on testing them as well. Their leaves are almost as leathery.
Hope this helps.
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