Yes, the British used the term at one time for any grain crop. It always seemed odd to me that, when I read a novel set in Britain, they would talk about cold and wet days in summer, yet speak of fields of corn. Later, I read somewhere that "corn" is a general term for grain. Makes sense, because you need lots of hot summer weather for growing corn/maize, but can grow rye, wheat and oats in the cooler growing season. as in Britain.
I guess salt grains could look like wheat grains, too!
I guess salt grains could look like wheat grains, too!