Tree Food

Tree Food is a special fertilizer used to grow the Tree of Wisdom. It costs $2500 per bag and can be purchased at Crazy Dave's Twiddydinkies. It can be fed to the Tree of Wisdom one bag at a time each one making it one foot taller. In order to grow it to 100 feet, the player will need to spend $237,500. In order to grow it 1000 feet, the player will need to spend $2,487,500.

Each time the player feeds it, it will give the player valuable information until it grows out of the screen, it will then just grow 1 foot per bag. It will give the player a random new cheat at set intervals as it gets taller. The cheats given will sometimes add random effects to the zombies that the player fights on mini-games and in Adventure Mode. Unfortunately, the codes can only be used if the player has already grown the Tree of Wisdom to the required height. These codes also only work on the regular zombie, the Conehead Zombie, and the Buckethead Zombie. The player can only acquire 10 bags at a time.

When the Tree of Wisdom reaches 1000 ft, however, it will stop giving the player wisdom, but the player can still grow it much taller. However, the tree will still give the player some flavor text that doesn't mean anything.

There is a limit to how tall the player can grow the Tree of Wisdom. 2,147,483,647 feet is the maximum height; feeding it any more will turn it back into a sapling which will not grow again unless you feed it for another 2,147,483,647 times. This is simply because computers cannot process 32-bit integers, and binary is a common system. 2,147,483,647 is one less than 232 (the 32nd "bit" of the binary system), and after feeding the tree, it would return to a sapling. The height of the tree is then reversed to -2,147,483,647, thus forcing the player to feed the tree another 2,147,483,647 times, bringing the height back to 0, allowing to process to begin again. It costs $5,368,709,117,500 (around $5.4 trillion) to get the tree to maximum height. However, nobody has gotten the tree to do so without cheating.

Tree Food is not in the iOS version of Plants vs. Zombies, since there is no Tree of Wisdom. Instead, bacon is used to spend the player's money on (even though it does nothing).