Charles Ellicott Commentary Exodus 9:22

"And Jehovah said unto Moses, Stretch forth thy hand toward heaven, that there may be hail in all the land of Egypt, upon man, and upon beast, and upon every herb of the field, throughout the land of Egypt." — Exodus 9:22 (ASV)

Upon every herb of the field. —The damage that hail can do to crops is well known, and has given rise among us to a special form of insurance. Such a storm as described here would necessarily have destroyed all vegetation that was more than a few inches high, and must have greatly injured shrubs and fruit-trees. (Exodus 9:31.)