Final answer:
The question appears to relate to the symbolism of pomegranates, potentially in Khaled Hosseini's 'The Kite Runner', symbolizing the state of Amir and Hassan's friendship. Without context from the correct text, an accurate answer cannot be provided.
Step-by-step explanation:
The passage provided does not directly discuss pomegranates growing on a hill, which suggests that the question might be related to another text, possibly a novel such as 'The Kite Runner' by Khaled Hosseini. Therefore, based on the question's wording and a common understanding of the symbolism in Hosseini's novel, we might interpret that the pomegranates could symbolize Amir and Hassan's friendship, which experiences both beauty and tumult.
However, without the specific context from the correct text, it is impossible to provide an accurate answer to the question "What is significant about the pomegranates growing on the hill?" The mentioning of Himalayan mud, dispersion of the family, and the grandfather's lost identity in the passage does reflect themes of loss, nostalgia, and the search for self, which might be metaphorically connected to the growth of pomegranates as a symbol of something that once was intact but is now scattered.