1 inch of rain per year is less than many
of the world's most arid places get.
That's a real desert, and
probably could not support any grass.
In the Sahara desert, which occupies half of the continent of Africa, the
annual rainfall ranges from 0.8 to 3.9 inches per year. You can see that
1 inch per year is near the bottom of the Sahara's range !
