Plants vs. Zombies Cheats & Codes

Easy Zen Garden Earnings

You needn't actually be actively playing the game in order for the Zen Garden to continue producing coins. The game needs to be running, with the Zen Garden selected and showing on-screen, but you can then let it run in the background while doing anything else you like (gaming, browsing, whatever) and the game will not pause itself. Instead, coins will continue to appear in the garden at the usual rate.
You can either occasionally return to the game in order to manually collect the coins which have been produced or, to be sure that you are missing no coins, buy Stinky the Snail from Crazy Dave's Shop and let him pick up the coins on your behalf. If you have a sufficient number of plants regularly producing coins, Stinky will remain awake and continue to gather them. Otherwise, he will fall asleep occasionally. In that case, you only need to return to the game every so often and click on the snail to wake him up again. You can also ensure that he stays awake longer (and therefore collects more coins without your interaction being required) by feeding him a piece of chocolate.

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Submitted by:IGN_Cheats

Unlimited Money

Once you have the Zen Garden, water the plants until they don't need anything else. After that, change the Date on your PC to another day. As soon as you do, the plants will need water again. Repeat this -- buy new plants, grow them to full size, sell and repeat to earn money.
This also works to get Marigolds in Crazy Dave's shop when they are out of stock. You can fill up your Zen Garden and make all the money you need. You don't even have to close out of the game.
Additions by dragonfellow17