Metal-nut

The Metal-nut is a powerful defensive plant that is also a robot.

Stats
HP: 300

Special: Explodes in a 3x3 radius, dealing 1 instant kill of damage, when defeated.

Cost: 275 sun

Recharge: Slow

Strategy
It is a vital part of your defenses when there are tons of zombies. Remember, Gargantuar smashes do, in fact, count as it being eaten, causing an explosion.