I have 6 varieties of Passion Vine. None of which are the palatable fruit varieties, (I don’t think) , and I’m wondering why after hand pollinating common passion flowers as seen on the Internet tutorial videos, the flowers are still falling off. The vine it’s self is very healthy, lots of flowers every day, good exposure. I don’t over or under fertilize, and the drainage / retention is good. I know the variety fruits , whether tasty or not, I just want the seeds. Any ideas?