Flowers are among the most delicate yet powerful environmental cues through which period drama constructs historical atmosphere. This study examines the visual role of flowers in royal social interiors in Victoria and The Crown, comparing screen representations of the early reigns of Queen Victoria and Queen Elizabeth II, respectively. The analysis focuses on dining rooms, drawing rooms, ballrooms and other spaces of formal sociability, where monarchy is staged through domestic ritual, ceremonial display and elite interaction. Floral presence is defined as the visibility, distribution and visual significance of flowers and floral motifs within a scene, including table arrangements, costume, hairstyle, props and interior decoration. Using comparative visual analysis informed by environmental psychology, selected scenes are coded according to the scale, density, placement, colour palette, distribution and symbolic function of floral elements across the body, furniture, table, room and mise-en-scène. Particular attention is given to how flowers organise the affective atmosphere, social meaning and perceived identity of royal interiors. Preliminary findings suggest a contrast. Victoria constructs a pervasive floral aesthetic, associating flowers with youth, romance, femininity and ornamental abundance. The Crown, by contrast, presents flowers in a more restrained and spatially controlled manner, linking them to protocol, institutional formality and post-war discipline. In dialogue with scholarship on period drama, mise-en-scène and Victorian floral symbolism, these findings suggest that flowers should not be understood as passive ornament, but as environmental and symbolic cues through which period drama constructs distinct psychological atmospheres of monarchy across historical eras.