When To Say Blessing over New Fruit Blossoms

The first time each year that you see blossoms on an edible-fruit tree, say the blessing “shelo chisar ba'olamo davar….” It may be anytime throughout the year, not only in Nisan. If you live in a region in which fruit trees blossom all year round, you should say “shelo chisar”... in Nisan after you see some new blossoms.
Note You may say the blessing on a single tree, even though the blessing says “trees” (plural).