Mythologies of many different cultures all seek to explain various natural phenomena with a story. Greek myths often attempt to explain the reason for hard to understand concepts like what happens after death, why it rains, or why people with extraordinary talents exist. They are often tools to teach moral or social lessons, explaining what might happen should you deviate from the right path.
persephone pomegranate - Symbolism in Persephone myth
The pomegranate is a symbol for life and abundance, and for death. The many seeds show the capability of new life & new growth. However, the pomegranate seems to bleed if it is cut, and it is the one thing that ties Persephone to the world of the dead.
Winter represents the time that Persephone spends in the Underworld. The living world seems suspended because the plants "die", the weather becomes harsh, and the days are shorter and darker.
Spring is Persephone's time. She returns from the Underworld and is reunited with her mother. Days become longer and warmer, plants come alive, and animals become active.