The Five Types of Grain
In Rabbinic Judaism, this requirement is restricted to the five classical grains of Judaism - Wheat, Barley, Oat, Spelt, and Rye; any of these grains (or products made from them) that are too "young" to pass the requirement are referred to in Judaism as Chadash ("new "). Additionally, the Rabbinic interpretation requires grain to have taken root prior to the Omer offering for it to become permitted; therefore, grains planted after Passover could only be consumed -at earliest- twelve months later.
Following the destruction of the Temple in Jerusalem, the Omer offering is no longer offered. Hence, Chazal enacted that the new grain becomes permissible following the date on which the offering was brought in ancient times.
Read more about this topic: Chadash
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