It is not a common thing to see rain in the desert because desert is a dry place where It rarely rains. That's why rain in the desert is considered a benefaction. The rain in the dessert is seen as a blessing or as a gift.
Most of desert plants have thorns because they keep water in their thorns.
The words from Li-Young Lee's in "From Blossoms" that most clearly help create a positive mood are "sweet" and "nectar" because these words gets an ideia of sweet, good things to the reader.
