https://en.wikipedia.org/wiki/Stolon https://en.wikipedia.org/wiki/Stolon - they're pretty common, but yes potatoes are somewhat rarer in growing underground.

https://en.wikipedia.org/wiki/Stolon https://en.wikipedia.org/wiki/Stolon - they're pretty common, but yes potatoes are somewhat rarer in growing underground. Keep in mind they also still grow "normally" from seeds; there are true "potato fruits" (completely inedible due to the solanine) produced from flowers that contain seeds which grow new potatoes. It's just not economical to grow them this way. https://en.wikipedia.org/wiki/Potato_fruit https://en.wikipedia.org/wiki/Potato_fruit