I thought I would post a few pics. The N. ventricosa pic shows the effect of using coffee. There was a big increase in pitcher size after a couple of applications a few weeks apart, which is obvious in the photo. I'm a believer now.
N. truncata x veitchii
N. x mixta
N. x hookeriana
N. veitchii LL
N. ventricosa "red"
N. truncata x veitchii
N. x mixta
N. x hookeriana
N. veitchii LL
N. ventricosa "red"