RuneScape Classic Wiki
RuneScape Classic Wiki
The main RuneScape Wiki has an article on: Potato
The Old School RuneScape Wiki also has an article on Potato.

Potatoes are a food item which players can use to make stew and curry. They can be bought from shops or picked from potato plants, which can be found in many places throughout RuneScape Classic, including the farms north of Lumbridge and East Ardougne.

Potato plant.png Locations