Zombies Enemy: Regular Zombie, Conehead Zombie, Ladder Zombie, Bungee Zombie
Recommended Plants: Auto
Reward: Garlic Plant
Put down all of your plants, place the chompers near the front and protect them with pumpkins. Use cherry bombs when you see bungee zombies coming to get you, as well as take down mobs of zombies if they are all attacking a single plant.
If you want to save your cherries, you can even sacrifice a couple of flower pots early on in the stage. However, you can more or less beat the stage without losing any plants if you play your plant cards right.