My mother has a pomgrante (sp?) tree that bears small tiny fruit. Before it can ripen the small fruit falls off onto

the ground. She is 87 years old and wants to find out if you are supposed to fertilize and if so what type to help this tree bear fruit and for it to get ripe. Could anyone help me

find out how to learn about this type tree?

thank you in advance for any help.

(by the way we live in s.c.)