Dumbcane

Dumbcane kils the first three zombies who eat it, by poisoning they and degrading as they eat it.

It's based on the Dumbcane

Powers
The Dumbcane's main power is to kill the first two zombies who eat it.

If plant food is applied on it, three zombies die and five became sick and contamined

Trivia

 * The real Dumbcane is actually the poisonous plant ever.