Which feature primarily helps to balance the weight of a bouquet during design?

The length of the handle plays a crucial role in balancing the weight of a bouquet. A well-proportioned handle allows for better distribution of the floral material's weight, making it easier to carry and aesthetically pleasing when held. If the handle is too long or too short in relation to the bouquet's weight, it can lead to an unbalanced look and feel, which can detract from the overall presentation of the arrangement.

While the arrangement of flowers, the placement of the water source, and the type of wire used all contribute to the aesthetics and structural integrity of the bouquet, these elements do not primarily focus on balancing the weight in the same way that the handle's length does. Proper balance ensures that the bouquet is not only visually appealing but also practical for the person carrying it, enhancing the overall experience.