At the very end of the games, when the announcement is made that they both can't survive
poison berries
The Nightlock
Nightlock Berries :)
Nightlock. They pop up many times in later books.
nightlock
The nightlock berries represented rebellion against the capital
Nightlock.
Nightlock
Nightlock
By holding out the poisonous berries called nightlock.
President Snow forced Seneca Crane (the Head Gamemaker for the 74th Annual Hunger Games) to each the berries. Specifically, they were nightlock berries, the same berries Katniss and Peeta pretended to eat in order to fool the Capitol and win the games. Seneca was forced to eat them as punishment for placing nightlock in the arena, as though it was his fault Katniss and Peeta pulled the suicide stunt.