I have several passiflora of the same species that bloom all summer and set fruit. When the fruit is still green, it feels hard. When I let it ripen to an orange color or when it falls off the vine, the fruit is almost completely hollow. It only has a little tasteless pulp stuck to the inside of the skin. It is also seedless. I was wondering how to get fruit that's worth eating. Do I need to cross polinate with a different species, or is it just this particular species? Any help is appreciated.