A Poisonous Potato is a type of potato food item that can poison the player. They can be obtained through by either harvesting potato plants, which will have a 2% chance of dropping, by killing a zombie, or by finding them in stacks of 2–6 in Shipwrecks, which will be found in 44.9% of their supply chets.
A poisonous potato cannot be baked or planted like a normal potato, nor do they have a use with the Compost. When eaten, it can cause rapid damage to a player (similar to a Spider Eye, though not as dangerous). A poisonous potato has a 60% chance of poisoning a player for 5 seconds.