Sunflower

Sunflower is the second plant you get in the Plants vs Zombies game. It is the most important plant.

Info
This is the most important plant in the game. As Sunflower is the only plant that can give you sun (Unless you count Sun-Shroom and Twin Sunflower)

Stratergy
It is recommended to plant Sunflowers in the back columns, as they cannot defend themselves. 2 columns of Sunflowers is the most recommended amount.