Jeff Heepke

(Mary Delach Leonard, St. Louis Public Radio)

There's a pretty good chance that the jar of horseradish you have in the refrigerator has its origins in farms located just across the river from St. Louis.

St. Clair and Madison counties in Illinois produce the lion's share of horseradish in the U.S. According to the U.S. Department of Agriculture, just 16 growers in Illinois harvest horseradish from 1,779 acres, accounting for about 60 percent of the nation's horseradish. Nationally, only about 3,100 acres are in horseradish production.