Liana

Usage
Liana is a plant that can catch a large group of zombies in 5x5 areas and make all of them move exceedingly slower and then he will disappear but those zombies will be extremely slower until all of them death.

Strategy
Liana is a marvelous plant to make a huge group of zombie and reduce a huge about of their speed so you should use him against high-toughness zombies or high-speed zombies.

Trivia

 * Zombies that are caught by him will have green smudge on their body and have a long creeper connect each other across their lane to represent that they are tremendously slower.