hello,i have a nepenthes ventricosa for 2 years now.it puts out lots of pitchers.my question is,how tall will this plant get?it is now a foot and a half.will it begin to start vining?should i trim it and if i do how tall should it get before trimming?it also sits in a 4"pot.never repotted.scared to do anything in case i kill it!it's been indoors in an east window with a grow lite about a foot away.(not fluorescent)lso how big a pot should it go into,on different sites i see it growing in large hanging pots.this plant doesn't want to fill a pot.just grows straight up.thank you all for your time and any info..