One of the many pots I've used this year has potatoes, among other things growing in it. As you may be able to tell from the picture, it also has mint, beans, and corn.
The potatoes are growing so fast though that the other plants, besides the mint, are not keeping up.
The pot is pretty deep though so I'm hoping that at least I'll have some nice potatoes after the season is over.
They were started from a potato that I hadn't gotten around to cooking that had started forming eyes.