Firnace is a plant in Plants vs. Zombies Online. It shoots fireballs at the zombies. The longer you click-hold on Firnace, the larger and more damaging the fireball is. It is unlocked on Day 7 of the Industrial Revolution, and is the fourth plant to be unlocked in that world.


Firnace is a "tap-to-fire plant", however, simply clicking on Firnace will release a fireball of minor damage. To increase the damage it does, the player must hold down on Firnace to charge it up, and then release to fire. There are four different stages of damage it can do: Light, Normal, Medium, and Huge.

Almanac Entry

Sun Cost: 475

Damage: Light-Huge
Area: 1 Lane
Recharge: Slow

Hold click on Firnaces to charge up a giant fireball that does damage to zombies in the lane based on the time of charging.

All the plants know Firnace for his huge temper. At first, he seems like a calm guy, but grind his gears and he’ll really heat up. He is currently seeking anger management therapy and likes to head by the pool to let off some steam.

Plant Food Effect

Firnace shoots three fireball to do huge damage in it's lane, regardless of how long it was charged.


  • Its name is a portmanteau of Fir, a type of tree, and furnace.
  • It is one of two tree plants obtained in the Industrial Revolution