plant hardiness en Warming Trend in Illinois <p>The US Department of Agriculture is confirming what gardeners in Illinois already knew: it has become warmer in the state during recent years.&nbsp;&nbsp;<br /><br />The change can be seen in <a href="" target="_blank">the USDA&#39;s plant hardiness map</a> that appears on the back of packages for seeds and plants.&nbsp;<br /><br />State climatologist Jim Angel said the previous map was based on a much colder period in Illinois history.<br /> Mon, 27 Feb 2012 17:37:47 +0000 Rich Egger 10893 at Warming Trend in Illinois