Hello DJOKO;
While fresh passion fruit seed may
germinate better and faster I have had
good results with older seed.
Passiflora seed does not need cold treatment I usually soak the seed
overnight starting with warm water.
Cover the seed about 1/2 inch and give
high temp. at least 80 degrees and wait
I have had seed germinate after 10 months so be patient.
Hope this helps,
Sincerely.
Bill Barron