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New Plant Hardiness Zone Map Has Iowa in Zone 5. Article | Fri, 01/27/2012 - 09:39 | By Richard Jauron, Jennifer Bousselot, Willy Klein. AMES, Iowa â Gardeners and researchers have a new, updated plant hardiness zone map to consider as they make plant selection decisions this year. The U.S. Department of Agriculture (USDA) released the new version of the map this week â the first update since 1990 â with much of Iowa now considered Zone 5. Plant hardiness zone designations represent the average annual minimum temperatures at a given location.
Iowa produces, by far, the most corn in the United States. It supplies almost 20 percent of the country's annual corn. Corn is the largest crop grown in the United States. In 2011, over 92 acres were farmed for corn alone, which results in between 12 and 13 billion bushels of corn per year.