A quick google search (feijoa pollination and passionflower pollination) uncovered that there are some self-fertile feijoa and passionflower, but that not all are. Do you still have the tags so you can look at the cultivar info?

Even a plant of low self-fertility should set a few fruits from hundreds of blossoms. My feijoa is outdoors and I have hand-pollinated it, but other feijoa plants in the area get no special attention and they fruit also.

Perhaps your potted feijoa is not kept wet enough during/after bloom? Do the blossoms result in even a tiny proto-fruit (enlarged stem portion just below the blossom)?
Is it consistently 90 degrees during this period? Feijoas are said to not fruit well in heat.

Is there room for another variety of feijoa to "mate" with the existing one?

You may have to be satisfied with eating the petals!

My impression--and I could be totally wrong here, so someone please correct any mistakes:

P. edulis 'Frederick' is partially self-fertile--you will get some fruit without an outside pollinator. How much you will get is unclear to me. I actually have a plant on order, so I'm curious as well!

Apparently you can increase the yield of fruit, but only by pollination with a different P. edulis clone (i.e. not 'Frederick') and in particular one of the purple varieties. I do not know whether the other "red" varieties (purple x yellow like 'Frederick') will work.

Apparently the purple varieties are self-fertile, flavicarpa (the yellow P. edulis) is not, P. Frederick is a cross between the two, and its fertility is somewhere in the middle.

As I say, no promises I got this right!

Bottom line, I think you need to buy another P. edulis to get the most fruit (or maybe any at all it seems). I noticed a few places say that the 'Black Night' cultivar was bred specifically to be compact, so this might be a good choice if you need to add just one more plant in the smallest possible space.

Here's an idea:

Is the pollen stable enough that someone out there could send you a brush impregnated with pollen from a different P. edulis variety? That way if it worked you could invest in the money/space for a new plant. Maybe the person with the pollen-bearing plant would even be able to spare a cutting?

Thanks for all the quick responses...

larry gene, your advice is very helpful. I think I can rule out the temperature thing, as the room has remained in the 70's and 80's during this period, but I will pay attention to other factors. The blossoms do show a small amount of thickening at the base before they fall off, at least compared to the newly opened ones.

I probably will end up finding room (and money) for another potted feijoa of a different variety for pollination, but I should also mention that I'm still keeping my fingers crossed. The plant has not completely finished blooming so there is still some hope, it just wouldn't be the kind of fruit set that I had imagined with all those flowers.

Fruitgirl and Mark4321: I have to confess that while the feijoa did have a "Nazemetz" tag on it, the passionfruit did not have a name tag. I have assumed "Frederick" because I had bought one of these from the same place for my brother (he said he got a few fruits the first summer outside in SoCal) and it seems to be the most common type for sale in Southern California.

It sounds like the passionfruit pollination is very complicated, so I think what I will do at this point is try growing a plant from grocery store fruit seed. If my original plant sets fruit in the meantime, great, but if not, perhaps it's not a Frederick, and maybe it will cross with the seedling. How does this sound?

Thanks again...

fabaceae_native,

Growing a new P. edulis does sound like a good idea. I understand it only takes 1-3 years and from what I gather the progeny of a good tasting fruit also tend to be tasty themselves. And it's always fun to grow from seed. Still, I don't know exactly what they sell in the supermarkets, but I would definitely go for a purple passion fruit (P. edulis f. edulis) and not the P. edulis flavicarpa (yellow) or the red cross.

In addition to waiting for my 'Frederick' in the mail, I'm actually waiting for seeds to germinate (7 days so far) as well as for yet another P. edulis variety to arrive from elsewhere--hedging my bets. You can never have too much P. edulis, I suppose.

Still, if you have the flowers, and someone else has the pollen, I think it would be very cool if you could do the quick experiment of trying to connect the two by mail if that's possible. I don't know exactly what the cheapest effective instrument would be (a cheap paintbrush?). Anyone out there have an idea?

Regarding pollination at a distance that I mention above. Apparently pollen is viable for only about 24 hours--you'd have to work fast. It wasn't clear to me which P. edulis form this is for. In case anyone is interested in wading through, it's a google books result. I'm having trouble linking to it, though. If you do a google search of: passiflora pollen viability days edulis it should be your top result.

Of course, the viability may depend heavily upon the exact conditions in which it's kept. I don't know if they looked at this systematically.