Demeter

Demeter was the goddess of earth and harvest.  She was also one of the original goddesses.  In some cases she is the most important goddess.  Once, her daughter Persephone was kidnaped by Hades and was brought to the underworld.  This saddened her so much that she did not allow plants to grow and crops to be harvested.  It was a very hard time for the humans and they suffered greatly.  When Demeter got Persephone back everything was better.  This explains her importance in the world.  She allowed plants to grow and be harvested.  She was an interesting goddess because she almost made the seasons.  When her daughter Persephone was in the underworld, she ate only three pomegranate seeds which forced her to stay in the underworld for parts of year.  When Persephone was in the underworld, Demeter was sad and the weather turned cold.  When Persephone was on earth and with her mother, the earth was nice and flowers grew.