For Demeter to make the crops grow she had to stay happy so people did everything in their power to make her happy, but the thing that made her the happiest was her daughter.
where did you go Persephone!!
The God Hades wanted to take his three headed dog Cerberus on a walk to Earth.
let me go home and I won't eat .
So do you agree that the girl can leave for six months .
When Hades came to Earth Persephone saw Hades dog Cerberus, and Persephone played with him. Then Hades fell in love with his niece and plotted something so evil as to steal her and take her to the under world.
When Demeter noticed that Persephone was missing she didn't have time or the will to make the crop grow so all the plants died then Zeus noticed and took some action.
Hades took Persephone and put her in the farthest place where no one will find her in the underworld. But Zeus had a plan to take his son Hermes to make a deal with Hades to let Persephone leave for six months to her mother and the other six with Hades being his wife.
That is why the seasons change Demeter is sad during winter and fall and happy during spring and summer because her daughter return to Earth.