Pumpkin

The Pumpkin is the third defensive structure in the game. Unlike the Wall-nut or Tall-nut, it does not take occupy a garden space for itself, allowing other plants [besides another Pumpkin or a Cob Cannon] to be planted and protected in the same spot.

Usage
It costs 125 Sun to plant a pumpkin. Pumpkins can be planted on bare soil or another plant. Other Plants can also be placed in an empty Pumpkin. When a Zombie is attacking the space, the pumpkin takes damage until it is destroyed. Pumpkins have the same healthas the Wall-nut.

Strategy
Pumpkins are excellent on later levels, where the player needs to eke out as much space as possible. When Bungee Zombies are about to attack a square, they take the plant inside the pumpkin first. Pumpkins are useless against catapult zombies, except when you use them as fodder, meaning you place them at the back, empty. They can be used to buy time so that your plants have more time to take out Digger Zombies, as well. The best plant to put inside a Pumpkin (for defensive purposes) is the Tall-Nut, so Pole Vaulting Zombies or Dolphin Zombies cannot jump over them, and the zombies will still have to eat the Tall-nut even if the Pumpkin is breached. Note, however, that it is not as efficient, sun-wise, as a tall-nut though it has more health, since it has less than twice the health of the tall-nut while costing twice the amount of a tall-nut. They are also useful for plants that the Imitater duplicates, because it will be protected as it is transforming.

Potato Mines and the Pumpkin also are an excellent combo, as the Pumpkin protects the Mine as it is arming itself.