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Everything I see on corn saysEverything I see on corn says to plant them close together and to then thin them out when they are 4 inches tall or so. The seed pack says plant 4" apart then thin to 12" this sits says plant 9"-12" apart then thin to 16"-23" apart when 4" tall. Why plane them so close together to start? Is this when the pollination occurs? I thought it occurred in a more mature plant. Any information would be much appreciated. Thank you.