Plant Food was an item in Plants vs. Zombies Online that gave plants more powerful effects. It was obtained by killing glowing green zombies. To use it, the player simply clicked the plant they want to use Plant Food on. Note that unlike in Plants vs. Zombies 2, when using Plant Food, the plants' health was not replenished, and they were vulnerable during their effect. The plants listed below did not have a Plant Food effect because they were single and instant-use plants, with the exception of Sod:
Temporarily fills the row with spikes poking up from the ground and pulls all the zombies in the lane onto the Spikeweed. This lasts for 4.5 seconds. The secondary spikes can destroy rolling items and hurt zombies being pulled towards the Spikeweed.
Temporarily fills the row with other spikes poking up from the ground and pulls zombies onto the Spikerock. This lasts for 4.5 seconds. Like Spikeweed, the secondary spikes can destroy rolling objects and damage zombies being pulled towards the Spikerock.
Shoots a giant plasma ball and flings all the zombies out of the lane. If it hits a robotic zombie, such as a Robo-Cone Zombie, or any type of Gargantuar, the plasma ball will stop, but the robotic zombie or Gargantuar will be killed instantly. The plasma ball deals 200 damage to any zombie that is hit by it.