Nep quasi-noob alert.
I've been growing an AW N. inermis for a year or so (looked at my records - actually since Dec 9, 2010). The main vine (& the smaller basal) have produced pitchers on every leaf since I received it. Over the past two months, the pitchers on the main vine have moved slowly toward a smaller peristome and also a larger, more round pitcher shape. The last pitcher (pic below) has a small, somewhat-ragged, almost remnant of a peristome. Since this pitcher, the vine has produced 3 leaves & is working on a 4th. Not one of the tendrils is even remotely thinking about inflating a pitcher. The plant is now putting all of it's energy into vining & not producing pitchers (my aristo also did this last year when it moved into vine mode).
How does one go about getting actual upper pitchers? With the N. aristolochioides, I kind-of understood since it was temperamental anyway & didn't pitcher on every leaf but the inermis has been 100% reliable - until now. I seem to recall something that some Neps upper tendrils need to wrap around something before they will inflate a pitcher - is that true?
Suggestions, thoughts welcome ...