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It should be atleast 1000 feet tall to unlock all the secrets within the game.
f
Use cheat engine.
you can't add cheats on plant vs zombies but you can type on the screen the normal cheats like daisies,future etc.
There is a list of the various codes you can use on Chewy Central.
No, but there are some hints (for example hint for easy money or faster zen plants' growth).
TrickeDout Pinata Daisies Sunny Days Tohot Future Mustache
No there is no cheats
yes, but not in codes. you can get a trainer from here: http://www.cheatbook.de/trainer/plantsvszombies.htm
There are 2 that are widely known: sun cheat and money cheat. You can cheat this game with Cheat Engine.
no
There are no zombies cheats.