Walnut Bomb

 (核桃炸弹; pinyin: hétáo zhàdàn) is a plant in Plants vs. Zombies: All Stars. It attacks zombies that are close to it by using a strong headbutt on them. It is the upgrade of Saturn Peach Bomb.

Plant Food upgrade
Destruction giant-explosion: Explodes and deals damage to all enemies on-screen. It requires Tenacious Plant Food to activate.

Trivia

 * It resembles a brain instead of a nut.
 * However, it resembled a nut in the old design.
 * Its explosion is a backwards SPUDOW!.