When roses are processed you should leave on the outer petals until you are ready to design. These are called "guard petals" and shield the inner ones from bruising or creasing.
Peal down until you have a perfect, well shaped rose for your boutonniere. Your rose should be firm to the touch and as free from blemishes as possible.
I'm going to use decorative colored wire to create a coiled design that is going to enhance and turn an ordinary boutonniere into one with pure elegance.