I used contractor clean up bags (heavy duty trash bags) from Home Depot/Lowes with 10-15 gallons of old potting mix in each of them (2-3 five gallon buckets full)....a few holes poked in the bottom for drainage. I rolled the bags down and then added dried leaves for mulch as the plants grew up. I leaned some plywood boards against them to keep the sun off of the black bags. It worked pretty well, especially for harvesting, but I didn't keep up with the watering enough so the tubers were small.
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