Blooming" or "A Spotless Rose", is a Christmas carol
and Marian Hymn of German origin. The text is thought
to be penned by an anonymous author, and the piece
first appeared in print in the late 16th century. The
hymn has been used by both Catholics and Protestants,
with the focus of the song being Mary or Jesus,
respectively. In addition, there have been numerous
versions of the hymn, with varying texts and lengths.
(Wikipedia)