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Manager Jerry Holub looks at seed packages on display at the Earl May Nursery and Garden Center in Des Moines, Iowa, Tuesday. The USDA announced Wednesday color-coded map of planting zones often seen on the back of seed packets is being updated by the government, illustrating a hotter 21st century. In changing Des Moines, Holub doesn't think the warmer zone will have much of an impact on gardeners. (AP Photo/Charlie Neibergall)