Ice-shroom

Ice-shroom is an instant use plant. When planted, it will immobilize all zombies on screen for 5.5 seconds. Once unfrozen, the zombies will still be slowed down.

The Iceberg Lettuce is based on the Frozen Mushrooms

Powers
The Ice-shroom's power is to freeze all zombies in the whole screen.

If Plant Food is given to it, he'll keep the zombies frozen for even more time.

Trivia

 * It is the only movement-restricting plant that does not use a projectile to restrict movement.
 * The Ice-shroom, the Doom-shroom (when exploding), the Fume-shroom, and its upgrade are the biggest mushrooms.
 * It's coming to The Revenge of Zomboss in september 30.
 * This plant's ability is like Iceberg Lettuce's plant food ability, so it's perfect for Iceberg Lettuce's upgrade.