I have N. rafflesiana " squat red" and it grows really slow. The conditions are: 75-90 percent humidity and 75-80 degrees during the day, and 75-70 during the night. It produced one pitcher, but the pitcher never inflated, stayed extremely small, and the lid opened before the pitcher was even close to mature. Though it is pretty new...maybe that had something to do with it. Oh yeah...how big do the pitchers get?