In the game Plants vs. Zombies (PvZ) by PopCap Games, there isn't a weapon or plant that deals a specific 1800 damage points in one go to a zombie. The game mechanics are designed around a more tactical approach where different plants have various types of attacks, abilities, and damage ranges.
To give you an idea:
Plants typically deal damage over time, and each plant has a specific strategy and role in the game. High damage might be seen in later levels or when using power-ups (like the "Freeze" or "Ultimate Chomper"), which can increase the effectiveness of your plants or provide additional damage, respectively.
To deal with particularly tough enemies, players usually combine various plants to form effective defense strategies, rather than relying on a single plant or weapon to achieve high damage output.