Plants vs. Zombies Wiki
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This article is about content available solely in the People's Republic of China.
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They can be tough nuts to crack.
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For the Culture Medium as seen in Plants vs. Zombies Online, see Backpack (PvZO).

Culture Medium (培养液; pinyin: Péiyǎng yè) is an item in the Chinese version of Plants vs. Zombies 2. It has different types of rarity similar to the rarity of the plants, and 10 units of this item is required to upgrade a plant with its corresponding rarity to Level 5. It can only be bought from the shop of the Endless Challenge event or from certain offers. From the event, you will get Time Tokens that would let you buy them.