For some reason my N. Ventricosa has a little pointy pitcher shaped thing on the end of each tendril. The pointy thing is all brown and woody or something, and they haven't grown into pitchers yet. I'm kindof worried that there might be some problem with my plant, and I want to find out what's wrong so I can fix it and have it grow pitchers. What am I doing wrong? I tried to take pictures but they are too hard to see.