The Feast of the Assumption of Mary, as early as the tenth century, was a day reserved for the blessing of herbs and flowers, especially flowers that had a symbolic relation to Mary, the Mother of Jesus. People brought flowers and herbs to church on this day, marking the feast as a harvest festival of thanksgiving to God for the fruits of the earth. The Assumption of Mary was commemorated as early as the 4th century. (Source: Roman Ritual, 1964 edition)
The Mary Garden at Wisdom House, in this medieval tradition, is a place for reflection on some of the flowers named for Mary.