Seed Germination
Due to their hard shells, passion fruit seeds can take a long time to germinate - up to 3 months, however, there are numerous tips and tricks out there on the web that you can try. This is my method however which seems to work pretty well:

Lightly scarify the edge of the seeds by rubbing them against some sandpaper (just enough to take the "shine" off the seed in one place and allow water to penetrate
Soak seeds in tap water for 48 hours in warm water, changing water daily
Prepare a well draining compost mix - ideally 50% compost and 50% vermiculite
Ensure compost mix is damp but not wet
Place compost mix in seed tray or pots
Sow seeds individually circa 13mm deep
Cover with plastic dome (or other cover) but with air holes open
Keep at circa 20-25C and out of direct sunlight
Ensure compost mix does not dry out
Germination can be erratic - pot on any that germinate but dont give up on those that have not come up!