I really love this species. First, because it's geographically an outlier and I have a soft spot for misfits. Second, because it's named after the French botanist Eugène Vieillard and I'm an inveterate Francophile. Third, because I think it's pretty--but as the saying goes, "les goûts et les couleurs ne se discutent pas."
Anyway, I've had this little one for nearly two years. It was in LFS in a net pot on my grow rack/glorified windowsill and has been growing steadily, putting out pitchers, but hardly thriving. From what I can tell browsing this and other forums, N. vieillardii is a slow grower in nearly any condition and no one has found the plant's sweet spot.
There are reports of success with a mix based on akadama (http://carnivorousockhom.blogspot.co...-years-of.html), so I thought, why not give it a shot? I potted it up in that mix and threw in some laterite for good measure. I'll update this thread in the coming months. NB: This is totally unscientific, since there is no control plant and my conditions vary considerably according to the time of year.