There is a list of the various codes you can use on Chewy Central.
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.
plants vs zombies
Yes, there are several cheats for Plants vs. Zombies that can enhance gameplay. You can unlock all plants and zombies by entering the code "future" in the main menu. Additionally, typing "pinata" grants you a piñata party with rewards, while "mustache" unlocks a new game mode. Keep in mind that using cheats may affect your overall game experience.
TrickeDout Pinata Daisies Sunny Days Tohot Future Mustache
9999 plants vs zombies
Plants vs. Zombies happened in 2009.
you can download plants vs zombies at gamehouse
If you have Windows 7 you have Plants vs. Zombies for Free
plants vs zombies ps3 oao
plants vs zombies definetly