Once you beat Adventure Mode, chocolate and immature sprouts in dirt pots will be begin dropping from the zombies in different levels and mini-games.
Marigolds are on a very long timer, so the earlier you can put them down, the better. Root Factors For plant vs zombies 2 download - An
At 175 suns, this is an effective way to increase your damage permanently in every row.
Maybe a really beefy zombie could be wearing a shirt that says, I