Minecraft wiki entry for Potato, associated text: Fully grown potato crops drop 1 to 5 potatoes (about 3 per crop harvested on average) and have a 2% chance of dropping an additional poisonous potato. Potato yield can be increased using a tool enchanted with Fortune, with Fortune III harvesting an average of 5.3 potatoes. Bone meal can be used to mature the potato to its last stage of growth.