so whats the deal with all the phases a nepenthes goes through? theres lower, intermediate, and upper pitchers. and they all apparently look different? do they gradually morph into the next phase as the vine progresses or just "all of a sudden"? how does the plant know? and - is there a reason for the vine to change like this?
thats a lot of questions i know, but i cant seem to find much good info about this
technical jargon welcome