Which plants cross-pollinate?
I've a passiflora incense growing vigorously and an alata, which I plan to transplant so that it will grow vigorously (right now it's competing too much with the already-established incense).
Anyway, I was planning on getting a 3rd passion vine in order to get fruit from the alata and, hopefully, the incense. Someone told me that a caerulea would be good for this--but which kind of caerulea? All I can find here is Passiflora alatocaerulea, which I'm told is a hybrid & sterile. Will it still cross-pollinate or should I hold out for some other kind? Would an edulis cross-pollinate with alata and incense?