I've had some female ventricosas in the past produce seed pods with seed that were sterile. Heard that sometimes females that don't get fertilized can produce "dummy" seed. I have now a female N. maxima with seed pods that I didn't fertilize but had a male N. maxima X ventricosa male in flower at the same time nearby. My question is how can you tell viable seed from "dummy" seed? Do you have to try to germinate the seed as the only means for viability or can you tell by the seed shape and color?