I agree with the grow bags, they seem to be better at keeping the water vs burlap. I do my potatoes and get fingerlings a couple times a month. Dig around in the bag without pulling up the plant and it will continue to supply potatoes for the season. Check your local hydroponics store for the best prices or go on line to Gardeners Supply. The other plant I would add to your list is peppers. They love pots as their roots stay warmer. The most prolific bearers are the Hungarian bananas, they don't have the bell flavor but are great in everything with just a little spice if picked green or yellow.