Paul, I've also been having bad luck with some of their basic aristo hybrids: aristo x spectabilis and aristo x talangensis(?) (this appeared to be incorrectly labeled). I think you mentioned previously that the aristo x spectabilis appeared to be a chimera. Have you seen similar bad growth with their other basic hybrids?
This plant went on to produce a steady stream of superb upper pitchers last summer: https://nitrogenseekers.files.wordpr...2-77302806.jpg
There is one other BE aristolochioides cross I've tried, including aristolochioides X singalana and that one was a dog IMO: slow grower, very small plant that seemed never to hit its stride - I gave it away. The pitchers were pretty when it made lowers, but the couple of wee uppers I saw were as bland as can be - probably the singalana genes at fault there. (N. singalana uppers are very plain and colorless) Since that plant is just one data point, I can't say I think the BE aristolochioides is to blame for the poor vigor, but I can't help but wonder.
The EP cross of aristolochioides X bellii is vastly superior; vigor to beat the band and aesthetically a much more redeeming hybrid. See: https://nitrogenseekers.files.wordpress.com/2013/10/20131024-120006.jpg
I would also say that the ******* hybrid N. Involuntary Bliss (aristolochioides X mira) is a much better hybrid also, with great vigor, rich color, good size and it makes attractive uppers, which cannot be said for the BE singalana hybrid. Here is N. Involuntary Bliss: https://nitrogenseekers.files.wordpr...8/img_5308.jpg
So the question is: is the BE aristolochioides both a weak plant and a poor breeder? (if in fact that is the plant they've employed in hybridizing) I don't know, but in my limited experience, everyone else's aristolochioides hybrids are better than the ones BE produces.
I don't have a lot of aristo hybrids, but these guys do have it in the parentage
N. 'Rokko' x ("bokorensis" x aristolochioides) Clone A by hawken.carlton, on Flickr
N. 'Rokko' x ("bokorensis" x aristolochioides) Clone B by hawken.carlton, on Flickr
N. 'Rokko' x ("bokorensis" x aristolochioides) Clone C by hawken.carlton, on Flickr
Everything has a reason, whether big or small. Never underestimate the power of what is or is not.
There is far more to everything than meets the eye.