Which term refers to the repetitive use of forms in a floral design to create unity?

The term that refers to the repetitive use of forms in a floral design to create unity is rhythm. In floral design, rhythm is achieved when elements, such as shapes, colors, or textures, are used consistently throughout the arrangement. This repetition helps guide the viewer's eye from one part of the design to another, creating a sense of flow and cohesion. By establishing a rhythm through the use of similar shapes or spacing, designers can evoke a sense of movement and harmony within the composition.

In contrast, harmony relates to the overall pleasing arrangement of elements, while balance refers to the distribution of visual weight within a design. Contrast specifically emphasizes the differences between elements, such as light versus dark or rough versus smooth. All these concepts play important roles in floral design, but in the context of repetitive forms used to establish unity, rhythm is the most accurate term.