Mare Radish

Crab-Shroom are offensive plants that will move to the left or right, can be planted on water and can shovel up underground zombies

Overview
Crab-Shroom will, each minute, move 1 tile to the left or right, and will continue in the choosen direction until it reach to the x-most, where x is the position, then, it will move to the opposing direction. As an attacking plant, it can attack the 2 tiles in the front of it, and attack to it's left and right, damaging all the zombies in the ranged areas. In water, he can attack like in earth, but will also water 1 back tile that has no water