Shrubzero

Shrubzero is a premium plant in Plants vs. Zombies 2 that can be purchased with 4.99$.

Origins
Shrubzero is based on the Camellia sinensis, otherwise known as the tea shrub or the tea plant.

Its name is portmanteau of "subzero", below zero on the Celsius scale; below freezing, referring to its appearance and "tea shrub", the real-life plant it based on.

Overview
When Shrubzero is eaten, the zombie that eat her will frozen solid, like Ice Bloom. However, unlike Ice Bloom, a frozen solid zombie can absorb 4000 DPS (the same health as a Wall-nut) as opposed to 200 DPS. Like Electrici-tea, Shrubzero's ability can only activate when eaten.

Almanac entry
Despite her cute appearance, Shrubzero is notorious for her terrible ice puns. "Ice to see you" said Shrubzero.

Plant Food
When fed Plant Food, Shrubzero will become powered. Zombies that eat powered Shrubzero will frozen solid in crystal that absorbs more damage and falls down when destroyed, killing all zombies in front it.

Trivia

 * Her Almanac entry is a reference to Mr. Freeze from Batman.