The plateu that most of Maine's potatoes grow in is the Aroostook Plateu.
Maine
In terms of production, the answer is actually Washington.
The potato tubers (potatoes) grow below the ground, but most of the potato plant (leaves etc.) grows above ground.
No potatoes need dirt to grow
Yes potatoes grow in Idaho. That is why they are famous for their Idaho potatoes...
Potatoes are plants. They do not grow on other plants.
Potatoes
No. Grapes grow in a vineyard.
Potatoes grow underground from the eyes of a potato plant, not from seeds. The eyes sprout into new plants, which then produce more potatoes.
Most potatoes are produced in Idaho, the Potato state.
Potatoes are a root and grow best in moist soil.