I just read about someone treating a potato bed as a perennial.
Said he always had volenteers potatoes the next year from ones he'd missed--as I think we all do. So-he stopped digging, and just replanted at harvest time. He said he did this for 7 or 8 years.
I'd think, as long as you kept the ground in good shape, compost, etc it might work.
What do you think?