Deku Seed

Deku Seeds are items that are used as ammunition for the Fairy Slingshot in The Legend of Zelda: Ocarina of Time. They are one of the most common items in the game. Deku Seeds are sold at some stores, and Link can sometimes obtain them by cutting grass, breaking pots, or underneath rocks. The collected Deku Seeds are stored in the Deku Seed Bullet Bag. Link cannot use the Fairy Slingshot and Deku Seeds as an adult.

In The Legend of Zelda: Twilight Princess, a similar ammunition named Pumpkin Seeds are used for the Slingshot.