i dont know about the tropical species but for the more northern species of pitcher plants...actually whether the soil be wet or dry really depends on the species of pticher plant..also depending on the species.. it is probable that soil nutrient uptake is dependant on prey capture..but that hypothesis hasn't been proven yet so i dont know if it is true... it does seem like they all grow in nutrient-deficent habitats but insect capture is not the only form of nutrient uptake for these plants.. actually it only provides about 20-30% of what they need...other forms of nutrient uptake comes from rainwater, certain rotifers that live in them, and sometimes that also depends on where they are situated (light conditions etc.)...
personally i think the soil does play a part...but i agree with philip about keeping the soil nutrient level low in general....
this is actually quite interesting...maybe i should start a scape with sundews and pitcher plants..like in thier natural habitat..Can we grow sundews here??

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