In an age old tradition of the Church, the faithful experience a blessing of herbs and flowers on the Solemnity of the Assumption. Here is a blessing taken from the Byzantine ritual and so we ought to say the “Dormition”, this is the proper term in the East for what the Latins call the Assumption of Mary.
O almighty, eternal God, by your word alone You created out of nothing the heavens, earth, sea, and all things visible and invisible. You commanded that the earth give forth plants and trees for the needs of man and animal, each according to its need. In your infinite goodness You ordained that these plants serve not only as food for the animals but also as medicine for the sick body. We beseech you, bless these different plants and fruits and bestow upon them your blessing, and endow them with your power, so that they may serve man and animal like as a defense against all sickness and all that is impure: for You are our God and we give glory to You, Father, Son, and Holy Spirit, now and ever, and forever. Amen.
These flowers (or: plants) are blessed and sanctified by the sprinkling of this holy water in the name of the Father, and of the Son, and of the Holy Spirit. Amen.