Corn

Question

Why do some of my ears have huge kernels?

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Answer 1

This looks like corn smut, also known as Huitlacoche. It is a fungal disease, but infected ears are also eaten as a delicacy in Mexican cuisine. If you want to eat this corn you should probably check with a local expert to make sure it really is corn smut and safe to eat. Otherwise, there are ways to prevent its occurrence. See the following articles for more information:

https://www.gardeningknowhow.com/edible/vegetables/corn/corn-smut-fungus.htm

https://blog.mycology.cornell.edu/2007/11/13/huitlacoche/
http://ipm.illinois.edu/diseases/series200/rpd203/