I've grown potatoes in containers of 20 to 45-gallons, including smart pots and rubbermade totes. I didn't get a large yield, but it was fun. I had best results growing no more than one seed potato per 4 gallons of potting mix. Five red seed potatoes totaling about one pound in a 20-gallon container can produce 15 to 20 pounds of potatoes. Potatoes need full sun, loose soil, adequate fertilizing and steady moisture.
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