Some fruit may actually ripen without changing color that much. If you’re growing your own and find green fruit that has fallen from the tree, judge it by other methods before discarding.

Bruised or moldy portions can be trimmed from the rest. Mold that appears on the outside of intact skin can be washed away since you aren’t eating the skin. [6] X Research source

However, unripened fruit may also fall due to weather or if the tree is weak from dehydration. Double-check its ripeness by other methods before eating.

A mature passion fruit should be between four and eight centimeters in diameter and weigh between 1. 2 and 1. 8 ounces (35 and 50 g). [10] X Research source