By Rabbi Julian Sinclair, April 8, 2010
On Pesach we switch from mentioning rain in the Amidah to speaking of tal, dew. Instead of adding the words mashiv haruach umorid hagashem, "who makes the wind blow and the rain to fall", we begin saying instead morid hatal, "who causes the dew to fall".
Asking for rain, or dew, in England never seemed to make much sense. In Israel, however, dew is crucial for the growth of entire ecosystems. In parts of the Negev the average annual dewfall is greater than the average annual rainfall, and plants that grow there use every drop.