In other games, the upgrade method is different. In Plants vs. Zombies 2 (Chinese version), the only upgrade, Cob Cannon just needs to be unlocked and upgraded the same way as the first game, while in Plants vs. Zombies Online, the original plant needs to be planted on top of itself to upgrade.
|Plants vs. Zombies|
|Plants vs. Zombies 2 (Chinese version)|
|Plants vs. Zombies Online|
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