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  1. The USDA hardiness zone has changed a bit beginning last year. Chicago is now zone 5b. Here are two links that explain the changes and show growing zones for the rest of Illinios. http://www.plantmaps.com/interactive-illinois-usda-plant-zone-hardiness-map.php
    http://climateillinois.wordpress.com/2012/01/26/new-usda-plant-hardiness-zone-map/
    Happy gardening!

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