Which flower type is primarily used for structural support in arrangements?

Line flowers are primarily used for structural support in floral arrangements. These flowers are characterized by their long, straight stems and linear shapes, which help create height and structure within the design. Their natural tendency to stand upright makes them ideal for defining the dimensions of an arrangement and guiding the eye throughout the piece. Line flowers also serve to add depth and can create a framework around which other flower types—like mass and filler flowers—can be arranged. This foundational role is crucial in achieving balance and stability in floral design, allowing for an aesthetically pleasing arrangement.