According to the Wall Street Journal, corn and wheat futures are both up over 15% in the month of May, as continued flooding in the midwest has delayed planting. Soybean futures are not up as much due in large measure to the trad wars with China.
Corn crops generally have to be in the ground by early June, so the window for corn planting is nearly over.
The impact this will have on flour and other food prices is unknown, but it probably means prices will go up.