Persephone's Garden

It is a garden filled with different kind of plants and flowers. The most prominent fruit there is the pomegranate. In the Sword of Hades, Percy, Thalia and Nico were assembled together and fell down through a hole to the Underworld. After journeying and making it to Hades' palace, they have to walk through Persephone's garden. Percy nearly ate a fruit but Nico warned him that if you eat a single bite you will never want to leave the Underworld again.