I'm in zone 6b.
I have a "perennial" potato patch at my in-laws house from where I grew potatoes in 2019 and didn't find all the potatoes when digging that summer.
I'm experimenting with fall planting some yellow potatoes that sprouted in my pantry. I intercropped with onions and garlic in a small bed in the middle of our young orchard and mulched heavily with
hay (yes, I know, hay seeds will sprout, but if you keep mulch on all the time you really don't have to worry about weeds much.) I'm planning to do the same with the red potatoes that are also sprouting (except just intercrop with garlic bulbils since I'm out of onion sets and garlic cloves). I think it might work better with storage potatoes like Kennebecs, but it's an experiment and I want to get more Kennebecs for seed when planting the normal way in the spring when I am fairly confident of getting some return on my investment. I know I'll get garlic at least from this fall planting!