I have had a n. ventricosa in a tank here at work for about 5 months. Generally speaking, it has done VERY well. Its growing (too fast![img]http://www.**********.com/iB_html/non-cgi/emoticons/wink.gif[/img] and pitchering like mad (10 pitchers and more on the way). The humidity is pretty high (with air circulation), its in a west-facing window so it gets afternoon/evening light; temps are a little on the cool side because my office must be kept pretty cold (which I hate [img]http://www.**********.com/iB_html/non-cgi/emoticons/sad.gif[/img] )...I would say temp is about 70-ish in the tank.
My question is...it pitchers well; they are a good size (about 4"). But...after several weeks, the peristome, lid and half of the pitcher turns black. The bottom half stays alive. I can cut off the black part and the bottom half remains viable for quite a while. I don't remember this happening with my other ventricosa. So...I'm wondering what's causing the pitchers to blacken only halfway down? I don't know the natural lifespan of a ventricosa pitcher but it seems to me the pitchers on my other one lasted longer and didn't do the "half black" thing. I have a raff in there as well but its fairly new to the tank and a youngish plant and just has some small pitchers right now but has not had any pitchers blacken like that.
I can't provide optimum conditions for my CPs here at work but they've all done pretty well. The ping and drosera look great...and the ventricosa is growing like mad. Only the VFT has done rather poorly...too cool and not enough sun most likely.
I would just like to know if there is something I can do to stop the pitchers from blackening like that or if their lifespan is fairly short and its natural.
Thanks a bunch!