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Three-foot-high corn withThree-foot-high corn with only a spike tassel and no sign of an ear is an indication of barren soil. (Are you rotating the corn?) Do a soil test to check for missing nutrients. Your local coop extension should be able to help you.  

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?