Wheat has a lot of symbolic meanings. In old Yugoslavia, wheat was on the coat of arms representing farmers, it was on the side of the road stretching for miles, and it was used even in swearing (ситно жито ти јебем).
I'm sure that it is easy to see it in the USA as well, but you would have to know where to look for it. I don't see it on shields, and I do not see it by the highway. One place I found it was a flower shop. It was to be used as a decoration - one use I do not remember from the old country.

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ЖИТО

Од жита се прави хлеб и погача.
Жито је било и у старом грбу
Код ауто пута, одма' иза драча
И у кољиву, којим пуним трбу
Жито је и храна и знак
И кад је дан и када падне мрак