Hortus conclusus is a Latin term, meaning literally "enclosed garden". Both words in hortus conclusus refer linguistically to enclosure. It describes a genre of garden that was enclosed as a practical concern, a major theme in the history of gardening.
Having roots in the Song of Songs in the Hebrew scriptures, the term hortus conclusus has importantly been applied as an emblematic attribute and a title of the Virgin Mary in Medieval and Renaissance poetry and art, first appearing in paintings and manuscript illuminations about 1330
The term hortus conclusus is derived from the Vulgate Bible's Canticle of Canticles (also called the Song of Songs or Song of Solomon) 4:12, in Latin: "Hortus conclusus soror mea, sponsa, hortus conclusus, fons signatus" ("A garden enclosed is my sister, my spouse; a garden enclosed, a fountain sealed up.") This provided the shared linguistic culture of Christendom, expressed in homilies expounding the Song of Songs as allegory where the image of King Solomon's nuptial song to his bride was reinterpreted as the love and union between Christ and the Church, the mystical marriage with the Church as the Bride of Christ.
The verse "Thou art all fair, my love; there is no spot in thee" (4.7) from the Song was also regarded as a scriptural confirmation of the developing and still controversial doctrine of Mary's Immaculate Conception – being born without Original Sin ("macula" is Latin for spot).
Christian tradition states that Jesus Christ was conceived to Mary miraculously and without disrupting her virginity by the Holy Spirit, the third person of the Holy Trinity. As such, Mary in late medieval and Renaissance art, illustrating the long-held doctrine of the perpetual virginity of Mary, as well as the Immaculate Conception, was shown in or near a walled garden or yard. This was a representation of her "closed off" womb, which was to remain untouched, and also of her being protected, as by a wall, from sin.