DAKOTA, Minn. — 13-year-old Eli Klessig specializes in restoring antique tractors and "basically anything with an engine on it," he said on a weekday morning surrounded by tractor parts.

One feature of the wine's label is the image of the family's 1947 Massey-Harris tractor in front of an old shed at the Big Tree Road winery at the northern edge of St. Helena.