Magnet-shroom

attracts any small metallic objects that zombies have.

Plants vs. Zombies:The Fall of The World
They are awake in the day.

Plants Vs. Zombies: The Next Levels
Magnet-shroom remains unchanged.

Almanac: Magnet-shroom attracts all the ladies. No, literally, he really attracts them. He grabs the metal objects they have.