So about six months ago, I bought a N. Ventricosa - it arrived with one pitcher, and looked to be in pretty good shape, although small (I have him in a 3 inch pot).
Since then, he's been growing quite a bit, developing new pitcheres, all that good stuff. However, on a majority of the new pitchers (of the 4 new ones, all but one is affected by this), the lids never separate from the pitcher - or if they do open up, the lid barely separates from the pitcher (IE, you can fit your fingernail between them, but that's about it).
The biggest pitcher on this plant is...about two inches long.
Any ideas? Think it's a humidity/temperature issue, or some mutation?