why has my corn not bore cobs yet

Question

Why hasn’t my corn bore cobs – just seeds in grass shape?

Answer 1

Your corn could have been lacking enough nitrogen and water. As a result, it didn't initially produce enough foliage to make good corn. Corn demands more nitrogen and water than most crops. Water stress delays the emergence of the silk more than it delays the tassel. So pollination may be lacking. The pollen may be spent before much silk shows up. Here is more information that may help: http://www.agry.purdue.edu/ext/corn/news/timeless/silks.html
https://www.gardeningknowhow.com/edible/vegetables/corn/corn-not-producing-ears.htm