Passion Plant Has Sour Fruit

I have a very healthy passion fruit plant that is producing hundreds of fruit. Unfortunately, the fruits are sour, although the original parent plant had sweet fruits. Now my plant serves mainly as decoration as the fruit is too sour to enjoy. Is there a means, maybe by way of using specific fertilizers, that will make the fruits sweet?

Hardiness Zone: 11


marangman from Malaysia

By marangman