Sometimes, there's more behind the headline than meets the eye.

Maize is a seasonal crop in Nigeria. So, "growing everywhere" for a country where agriculture is 90% rain-fed does not preclude the need for imports. https://twitter.com/lazyreo/status/1301987879845941249

Most of the Maize in Nigeria is rain-fed, early maize is sown in the North by May/June and March/April in the South for Early maturing Seed variety while Late Maturing Maize variety is sown by July/August. Early maize is harvested by May and late Maize by October.

This tells you that by August/September and January/February you will have some scarcity. This is borne out by repeated findings of household surveys that show the North has seasonal food shortage in Aug/Sept and the South takes over in Jan/Feb. S

So, sometimes when the story sounds strange, peel back the layers a little bit with some research.