How to Get More Zen Garden Plants in 'Plants vs. Zombies'

Complete Adventure Mode. Though you only need to beat 5-4 to unlock the Zen Garden, completing the mode unlocks Survival: Endless, which gives you the best chance to get new plants in the garden.
Start a round of Survival: Endless. As the name informs you, the mode spawns zombies infinitely until they eventually overwhelm you. If you're good at the game, however, this is a great way to kill a large number of zombies to earn new plants -- especially since all varieties of plants can drop in this mode.
Purchase new upgrades for the Zen Garden from Crazy Dave. For $60,000, you can unlock two new gardens: the Mushroom Garden and the Aquarium Garden. The first garden lets you earn nocturnal plants rather than the ones you start out with that sleep during night.
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