Mystery-Shroom

Mystery-Shroom don't attack, but they spawn 3 random Shrooms vertically (if there is a plant above or below mystery-Shroom, it won't be able to spawn random Shrooms there).

It is a Premium Plant Introduced in Plants vs. Zombies 2 It costs $3.99 USD

Almanac Entry
Mystery-Shroom is the youngest in the room family. He hasn't really found his personality