The garden backgrounds of the tapestries are rich in floral imagery, featuring the "millefleurs" background style of a variety of small botanic elements. Invented by the weavers of the Gothic age, it became popular during the late medieval era and declined after the early Renaissance. There are more than a hundred plants represented in the tapestries, scattered across the green backgrounds of the panels, eighty-five of which have been identified by botanists. The particular flowers featured in the tapestries reflect the tapestries' major themes. In the unicorn series, the hunt takes place within a "Hortus conclusus", literally meaning "enclosed garden," which was not only a representation of a secular, physical garden, but a connection with the Annunciation.