What is the reason that we make a blessing on fruit trees which are about to blossom, known as birkat hailanot? Is there something unique about the potential blossoming of fruit trees versus any other natural phenomenon, which by and large we do not make blessings on, that necessitates a blessing?
The Kabala discusses the mystical reasons behind Birkat Hailanot. The Chida writes that there are different neshamot that might be locked up in the trees and by making the bracha we release them.
This is consistent with the idea that we make the bracha in Nissan and on fruit trees (because freeing up the neshamot is a parallel to the blossoming of the fruit).