Brassavola orchids are moth-pollinated in their native areas, so the flowers on the Brassavola nodosa are pale white to attract these nighttime pollinators (the fragrance also helps attract evening pollinators). You may find them in pale yellow or pale green colors, too, and the plant has been extensively hybridized to create flowers in a multitude of other colors. However, they are also self-pollinating so that indoor gardeners don't need to worry about bringing moths into the house.