Liberrian

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Liberrian is a plant that appears in Plants vs. Zombies 2: It's About Time and in Plants vs. Zombies: Dimensional Travels. It can slow and quiet zombies down.

Strategies
It is best to use it against Pianist Zombies, which will slow them down by 25%. This allows your other plants to take out the Pianist Zombies easily. Liberrian also works with any zombie that makes loud music, or loud noises.