Exodus 9:32 - Joseph Benson’s Commentary on the Old and New Testaments

They were not grown up Were hidden, or dark, as the margin reads it; or late, as many interpreters render the expression. This kind of corn, coming later up, was now tender, and hidden, either under ground, or in the herb, whereby it was secured both from the fire, by its greenness and moisture, and from the hail, by its pliableness and yielding to it: whereas the stalks of barley were more dry and stiff, and therefore more liable to be injured and destroyed by the fire and hail.