The Poisonweed is a passive plant that attacks, dealing normal damage and poison to any zombie that walks on it. The poison dealing 1 normal damage to the zombie each 2 second, the poison stay on the zombie for 6 seconds. They can only be planted on the ground (not even Lily Pads or Flower Pots, Freeze-o-Pots ) and does 5 attacks in the time it takes any normal speed zombie. (Faster zombies only take two hits) to pass over it. It will also pop the tires of the first Zomboni that drives over and a Catapult Zombie. Also, since the Poisonweed attacks from below, it can bypass shields.
Surbuban Almanac Entry[]
Poisonweed
Poisonweeds poisons and attacks zombies walk on it
Damage: Normal
Special: Make zombies poisoned
Cost: 250
Recharge: slow