Parashas Vaeira · Side page (no TT primary unit)
וְהַפִּשְׁתָּ֥ה וְהַשְּׂעֹרָ֖ה נֻכָּ֑תָה כִּ֤י הַשְּׂעֹרָה֙ אָבִ֔יב וְהַפִּשְׁתָּ֖ה גִּבְעֹֽל׃
Now the flax and barley were ruined, for the barley was in the ear and the flax was in bud;
Shemos Rabbah 9:10 — EXTRA.
הפשתה והשערה נכתה —\ldots לפי שהיו אביב.
English: “The flax and the barley were struck” — \ldots because they were already in the ear.
Custom
Chazal connect the damage to the crops that had already matured.