Which of the following is NOT typically a main component of a boutonniere?

The main components of a boutonniere typically include a single flower, some greenery or filler, and wire for support. Each of these elements plays a significant role in the structure and aesthetic of the boutonniere. The single flower serves as the focal point, while greenery or filler provides texture and visual balance. Wire is crucial for keeping the arrangement secure and assisting in the overall shape.

In this context, a decorative ribbon, while it can enhance the overall appearance of floral arrangements, is not a standard or essential component of a boutonniere. Boutonnieres are typically designed to be simple and elegant, often without the additional embellishment of ribbon. This helps maintain a sleek and polished look that aligns with the nature of formal attire, where a boutonniere is commonly worn.