just plant one per lane and i'm not what its called but plant a rapid shooting plant and behind it are plants that eat - it looks like a flower. im sure you know what i mean.
I play a LOT of Plants vs Zombies! My most favorite weapons are the cherry bomb and the watermelon. I finished the entire game in two weeks, and another week for the mini games. Now I'm always trying to beat my own record in the endless game part.
Build as many recharge big bomb as possible to get you to the end. You can use any normal strategies in the beginning part as you should be able to find an ideal way to handle front levels after playing for a couple of times.
Get the golden magnet and the upgraded purple mushroom. Most other things (like the frozen watermelon, corn missile) can wait.
Two rows of sunflower is good strategy. Abundant sun is always good. Good game. Had a problem finishing Bobsled Bonanza, but finally got my gold statue. Anyone tried to click the flowers in the main menu? Nice easter egg there.