Persephone was the goddess vegetation and daughter of Demeter, the goddess of harvest and fertility, and Zues, the god of the sky and thunder.
The wrath of Demeter
One day, Persephone was in the field with her friends picking flowers when she was amazed by the beauty of a certain flower, so she picked it up.
But the flower was planted by Hades, the king of the Underworld as a way to kidnap her and make her his wife, as he was in love with her. When she picked it up, it opened a portal to the Underworld and Hades then emerged in a chariot pulled by black horses. Before anyone noticed, he grabbed her and took her into his possession, made her queen of the Underworld, and she was not happy about it. She missed her mother back on Earth, as she would cry all day.
Meanwhile, on Earth, Demeter was devastated about the loss of her daughter. When Helios, God of the sun revealed that Persephone had been kidnapped by Hades, she became furious.
They decided that if it could be proved that she was held against her will in the Underworld that she could live with her parents again on mount olympus, otherwise she would stay. Hades then came up with a plan; he would give her pomegranate seeds that make you miss living in the Underworld. So when she was asked where she wanted to live, she said "with Hades".
Demeter accused Hades of tricking her daughter, and as punishment she stopped the growth of crops, resulting in a dry, lifeless ground. Mortals began suffering, and Zeus knew he had to do something. The final agreement was that Persephone would spend half the year with Hades and the other half on Earth with her mother. This myth was created to explain why there are different seasons. See, when Persephone was living with Hades, her mother was sad, so there were no flowers growing and vice versa.