INteresting discussion about densiflora/diatas. I, too, have found densiflora much more difficult than diatas, at least in relation to humidity. I grew densiflora outside for more than 18 months, it didn't produce a single pitcher the entire time, then it stopped growing, then the growing tips started to die back. I put in in the greenhouse and it started growing again, then started pitchering with every leaf. Definitely very picky on humidity. Diatas I grew outside and would pitcher every second or third leaf. Once in the greenhouse, it grew and pitchered like a weed.
Densiflora is quite small species, as is diatas.
Hamish