Which of the following is NOT a main component of floral design?

In floral design, the main components typically recognized are line, color, and texture. Each of these elements plays a crucial role in creating aesthetically pleasing arrangements.

Line refers to the visual path that the viewer's eye follows within the arrangement, which helps to create movement and guide the viewer's attention. Color adds visual interest and conveys emotions, influencing the overall mood of the piece. Texture contributes to the tactile quality and visual complexity of the arrangement, enhancing depth and interest.

Scale, while an important consideration in ensuring that an arrangement fits within its intended space and relates well to its surroundings, is not traditionally categorized as one of the core components of floral design. It is more related to the proportionality and balance within the arrangement rather than serving as a foundational design element. As such, it is the outlier among the main components listed in the question.