It's a weed whose height rivals that of many NBA players, it's increasingly herbicide-resistant, and it's spreading. The Des Moines Register has the story of "superweed" Palmer amaranth's spread through Iowa which they say could knock out 2/3 of the state's corn and soybean crops if it continues. »6/25/14 8:20am 6/25/14 8:20am
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