Every prayer we give to Our Lady is a flower. The rosary is famously roses, but all kinds of prayers are flowers of every kind given to Our Blessed Mother. This being Mom's Birthday, let's give her some flowers.
In the Divine Liturgy of St. John Chrysostom, the Church prays one of the most well known prayers to the Theotokos, the Birth-giver of God:
It is truly meet to bless thee, O Theotokos, who art ever blessed and all-blamelesss, and the mother of our God. More honorable than the Cherubim, and more glorious beyond compare than the Seraphim, thou who without stain barest God the Word, and art truly Theotokos: we magnify thee.Another famous prayer is the Akathist Hymn: