A person who goes out during the days of Nissan and sees fruit trees in bloom, says [the following] ‘bracha’ (blessing): “Blessed [are you G-d our G-d, king of the universe], who left nothing lacking in His world, and created within it good creatures and good trees with which He gives pleasure to people”. A person only says this blessing when he sees the [blooming trees] for the first time, once every year.