There is a difference of opinion among the Posqim (deciders of Jewish law) as to whether women are obligated to do Birkath Ha-ilanoth (the blessing on the trees) or not. The difference of opinion centers on whether or not this is a time-bound precept.
Women, as we know, are exempt from performing time-bound precepts. If Birkath Ha-ilanoth is not a time-bound precept, they should recite the Berakha (blessing), but if it is they may not recite the Berakha, because to do so would be to recite G-d's holy name in vain, which is something that must be avoided at all costs.
In view of this, women should not recite this blessing because of the possibility that they would be taking G-d's name in vain. There are those who say that the husband should have his wife in mind when reciting the blessing and that she should stand near him so that she can hear the blessing and have in mind that she is fulfilling her obligation through this. However, this is not the prevalent custom. Ashkenazi women who have the custom of reciting the blessing, should continue to do so.
(See Maamar Mordechai, Hilkhoth Haggim of Rab Mordechai Eliyahu, 2: 17).
