Certified GKH Gardening Expert
Do the baby caterpillars not eat the plant? I understand they won't if it isn't the right plant. Or do they just disappear as if eaten by a predator? It may not like that cultivar of passiflora. I read it is not native.
Here is info about passiflora species:
Here's an article about passion flowers and their associated butterflies. it mentions passiflora incarnata.