When I plant corn, all I get r tiny ears.
I've spaced from 6"-12" apart & still have small ears of corn but tall healthy stalks. Tried different locations in my garden every year but same results .
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See if this will answer your question.https://bonnieplants.com/growing/growing-corn/
What kind did you plant? How much sun? How much fertilizer?
Sounds like you may need to amend the soil, and fertilize a bit.