One who goes outdoors during the month of Nisan (this law is applicable only during the month of Nisan) and observes trees in bloom should recite the blessing: “Blessed are You, L-rd our G-d, King of the universe, who has made nothing lacking in His world, and created in it goodly creatures and goodly trees to give mankind pleasure.” This blessing is recited only once a year, the first time one observes blossoming trees during Nisan. If he observed such trees but failed to recite the blessing, he should recite it the next time he sees such trees, but he should omit the words, “L-rd our G-d, King of the universe”. Rather, he should state, “Blessed is the One Who has made...”
This blessing is not recited for a tree that does not produce fruit. The tree should be in blossom, prior to the production of fruit. Some are extra scrupulous to recite the blessing when seeing two such trees together. This blessing is recited by men and women alike. The majority of authorities permit reciting this blessing during Shabbat and Yom Tov. If one delayed until the blossoms have fallen and given way to fruit, he should recite the blessing without mentioning Hashem’s name, in the method described above.
Rav Yosef Yeshaya Braun, shlita, member of the Bet Din of Crown Heights; reprinted from crownheightsconnect.com
