Oxygen Algae (Plants vs. Zombies Online)

For the version in Plants vs. Zombies: Endless Edition, see Oxygen Algae. Oxygen Algae (氧气藻; pinyin: yǎngqì zǎo) was a plant and an environment modifier in Plants vs. Zombies Online. It was an aquatic plant, and as such can only be planted underwater. Since most plants cannot be planted underwater, the Oxygen Algae must be used. When planted, the player will be able to plant any other plant in a cross-shaped area but can also upgrade the oxygen range by spending sun on it. Oxygen Algae was the f

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