I'm going to give this white rose boutonniere a polished finish with a ribbon wrap on the stem.
I start up high, directly under the flower. If you find the ribbon slippery and hard to tightly wrap, you can secure on the back with a shortened pearl headed pin.
Wrap down the stem, taking care to overlap the edges so they bind all the way down.
Continue down, using your thumb to firmly hold the ribbon in place as you turn the boutonniere around.