I got worms so bad probably the third year, they ruined the plants but I had no idea not to plant in same location for consecutive years.
As the plants grow, just leave 3-4 inches of the plant showing, mound dirt around the plant and you will increase your yield.
Old Maine Potato farmer trick........when the plant gets high enough, place an old tire around it, fill the tire loosely with soil, as it grows, keep added tires as you can