The Plants Vs Zombies Mod for Minecraft is a mod that is based off of the game which the name is derived from. Instead of grass blocks, the Plants VS Zombies mod uses sun grass blocks. The sun grass block allows the player to plant various PVZ plants. Some of the plants include the Peashooter, the Sunflower and the Snow Pea.
Without this mod, one would not be able to easily survive. Without these plants, zombies can spawn while the player is in sleep mode. When the zombies spawn, they have the ability to walk into the house and kill the player while he is in bed. The plants protect the player while he is vulnerable.