Persephone's Flowers

Persephone's Flowers are flowers grown by Persephone in her garden. While some of them are just regular flowers, others can be used for more specific objectives, such as when Percy Jackson, Thalia Grace, and Nico di Angelo were on their adventure looking for the Sword of Hades, in which Persephone gives them two flowers to help.

Tracking Flower
A special flower that resembles a carnation. She gave Percy, Nico, and Thalia this flower to track the thief, who had stolen the Sword of Hades, as the flower would always point in his direction. The petals would die and drop off as he got closer to escaping the Underworld. It finally died when he released the Titan Iapetus. It is unknown what else it can do as this particular flower was created to only track Ethan Nakamura.

Travel Rose
After completing the mission, Persephone gave each of the demigods a red rose that, when crushed, would return them to the land of the living. These were similar to Poseidon's Pearls (in the movie, Persephone's pearls). Only Percy and Thalia used theirs as Nico wanted to stay in the Underworld and he could also leave through Shadow travel.

Trivia

 * Both types of flower are seen in The Demigod Files story, The Sword of Hades.