Charles Ellicott Commentary Zechariah 10:1

"Ask ye of Jehovah rain in the time of the latter rain, [even of] Jehovah that maketh lightnings; and he will give them showers of rain, to every one grass in the field." — Zechariah 10:1 (ASV)

Bright clouds. —Better, lightnings, which precede the longed-for rain. (Psalms 135:7.)

Grass... . —Compare to Deuteronomy 11:15.