If passion fruit plant flowers but if there there is no fruits,what can be done?

Question

is it something with self sterility of pollination?

Answer 1

Pollination is essential for fruit production on passion vines. Flowers of the purple passion vine normally set fruit when self-pollinated, but many yellow passion vines will not set fruit unless their flowers are dusted with pollen from a different vine that is genetically compatible. Thus, 2 plants grown from cuttings taken from the same vine cannot pollinate each other. Moreover, some vines from a group of seedlings can cross-pollinate and others cannot. This must be learned by trial and error as the plants develop. Ordinarily, many opportunities for cross-pollination exist in a large seedling population.

The most effective insect for pollinating passion fruit is the carpenter bee (Apidae, subfamily Anthophoridae), a large, solitary bee similar to the bumble bee in appearance. The native bee population may ensure adequate pollination in areas where wild maypops fruit naturally. Elsewhere, other means must be supplied. Carpenter bees can be encouraged by placing hollow logs in the field near the vines. Honeybees are less effective because of their small size and because they prefer to work other flowers at the time Passiflora is in bloom. They may be successful with the relatively small-flowered (and self-compatible) purple passion fruit under some conditions, however.

The giant granadilla also needs pollination to ensure fruit set. It requires mild temperatures for normal fruiting and may bloom but set no fruit (or misshapen fruit) during the hottest part of the summer. Hand pollination may be the easiest way to ensure fruit production on a few passion vines growing in the home garden.