Manager Jerry Holub looks at seed packages on display Tuesday at the Earl May Nursery and Garden Center in Des Moines, Iowa. The USDA today announced new maps for plant hardiness zones, a key to determine which plants can survive in what parts of the country. The government's official guide of colorful planting zones is being updated for a warmer 21st century. (AP Photo/Charlie Neibergall)
Read the article: New federal map of planting zones updated for warming, offers more interactive tech
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