Red Spray Rose Silk Boutonnière FlowerRed Spray Rose Size: About 1. 75" 4 cm diameter Although roses are among the most popular flowers, most are not suited for boutonnieres because they are too big and their stem is too thick and inflexible. We soon discovered that smaller spray roses suit a lapel much better. If you want to add a dash of color to your black tie outfit, add a red spring rose to your outfit if you don't like the size of a carnation. While not as bold as a red carnation,