Persephone was happy to go back and the land was fruitful once more. Only one thing bothered her, she had tasted four pomegranate seeds.
Persephone, my darling!
For those four seeds she tasted, she had to remain in the underworld with Hades for four mouths and for those mouths, the land did not grow (winter). But when she comes back again, the flowers blossom and every thing is fruitful again (spring).