ייִדישער מחשבֿה אויף שמות 9:31

The third phase of preparedness and progress towards the revelation at Sinai is revealed by the difference between the Omer offering which was offered immediately after Passover, and the shtey halechem, the two loaves of wheat bread offered on Shavuot, Pentecost. The former consisting of barley, is a food used for both man and beast, and ripens in early spring. (Exodus 9,31) Since at that time, Israel had not yet attained their specific maturity symbolised by wheat, a food exclusive for human consumption, the benediction she-hecheyanu is not yet in order until that status has been achieved. That benediction is recited over an accomplishment, something achieved, not over something towards which we strive, something yet to be realised.