Demeter is the goddess of harvest. She loved her daughter so much the crops grew and grew.
Hades. the god of the underworld. He was a gloomy god. Also he mostly hung out in the underworld.
One day Hades me to earth and took Persephone to the underworld.
Perephone was kidnapped by Hades. Her mother Demeter was so sad and didn't care if the crops died. All she cared about is looking for her daughter.
Zeus send one of his brother to go check on Hades. He saw Persephone and she wanted to get out. So they had a deal and said that Persephone had to marry Hades to go back to earth. So for every six months Persephone had to go back to the underworld.
Persephone went back to earth and saw her mother again. She saw so happy and the crops grew and grew again. But overtime Persephone had to leave the crops will die. So that is the reason why we have seasons like winter, fall spring and summer.