Iceberg Lettuce

The Iceberg Lettuce is a plant in Plants vs. Zombies 2: It's About Time. It costs 0 sun and freezes a Zombie that steps on it for approximately 10 seconds. It is based on the real life iceberg lettuce, also known as the crisphead. If a frozen Zombie is attacked by a fiery plant like Snapdragon, the Zombie will unfreeze and continue to move on.

Plant Food Upgrade
When Plant Food is used, all zombies will freeze for a short time, similar to the Ice-shroom from Plants vs. Zombies, however, the Iceberg Lettuce won't disappear.

Suburban Almanac Entry
Iceberg Lettuce

Sun cost: 0

AREA: Single

RANGE: Touch

RECHARGE: Sluggish

Iceberg Lettuces freeze a zombie when stepped on.

Special: explodes, temporarily freezing a zombie

Don't get lost staring into Iceberg's adorably cute eyes. If you do, it will be your last step... but only if you're a zombie.

Strategies
The Iceberg Lettuce is a basic plant to freeze zombies. Using it to freeze a Zombie early on can increase the amount of time to plant Sunflowers. However, unlike other one-use plants or freezing plants, the Iceberg Lettuce cannot damage a zombie. This makes it a zombie delayer, rather than a zombie killer. It's also ideal for zombies too tough to kill with the defenses, such as a Buckethead Zombie in a lane with the only attacking plant -- a Peashooter. The Plant Food upgrade freezes every zombie, and is especially useful during huge waves, but a waste of Plant Food against lone zombies. Pairing it up with another usage of Plant Food on a plant which hits all zombies, such as Cabbage-pult, can damage the zombies, let the defenses weaken the zombies, and kill most of the zombies at once. Iceberg Lettuce can freeze a whole line of Camel Zombies.

Trivia

 * Iceberg Lettuce cannot freeze the Zombot Sphinx-inator, but will slow it down.
 * If a missile from the Zombot Sphinx-inator hits it, it will disappear, but will still slow down the Zombot somehow.
 * If you use Plant Food on it, it will freeze every zombie on screen. However, instead of disappearing like Ice-shroom, it will stay on the lawn. It can be a good strategy to protect it and to use Plant Food on it where there are too many zombies.
 * This is one of the three plants in the series that never cost sun, the other two being the Puff-shroom and Sea-shroom.
 * Snapdragons and Torchwoods do not work well with this plant because their attacks will instantly thaw frozen zombies.
 * In Plants vs. Zombies: Official Guide to Protecting Your Brains, the Iceberg Lettuce is referred to as just "Iceberg".
 * While it is using Plant Food, its costume will disappear.
 * It seems to have the same costume as a Peashooter during Christmas.
 * It cannot freeze a machine that has been disabled by an E.M.Peach.
 * Iceberg Lettuce cannot be burned by lasers utilized by Gargantuar Primes.
 * In Plants vs. Zombies Online, Iceberg Lettuce can stop the Fireball of the Sphinx.