its a novena (i think you can find it in the peita book still, great devotional) that by the end of the novena you are supposed to recieve a rose if the prayer has been granted. they say that it’s unfailing, but i think that prayer and the spiritual life is a little more complicated than that. most of our prayers (in my experiance) are rarely answered in the ways that we had in mind. praying with confidence in the goodness of God and trusting in His ways are the basics of prayer- though it is nice to know that heaven has heard you when you recieve that rose.