Potatoes, Jerusalem Artichokes, Yacon, Yams, Sweet Potatoes in limited space in plastic pots in potting mix with poly dripper/timer irrigation. Descending size Reko pots will stack as shown to create greater height (bottoms cut out). Bunnings also now have black poly garbage bins ($9) which would be most suitable (shown). I grew this many Jerusalem artichokes in the shown pot (about ¼ of a pot) full WITHOUT any irrigation last summer. You likely have a space alongside your driveway or such where you could set up a line of them. The beauty is, you just tip over the pot when you are ready to harvest, take out the food and put the potting mix and one seeder root back in the pot (and some Osmacote). Set and forget:
