"To give your bouquet an extra layer of scent, you can actually use your perfume," Porcaro says. "Just add a decorative element that holds scent — feathers are an excellent choice — and spritz it down with your fragrance before you add it to your bouquet."
At the Coach Poppy Flower event, the bouquets had the same notes as the fragrance; there were lots of roses, jasmine, and lime leaves, which blended beautifully with the spritzed-on scent. If you want something similar, look at the accords in your perfumes and find one that shares some notes with the flowers in your bouquet.
Or if you want to add complexity to a simple single-flower bunch, like a handful of daffodils, then pick a scent with really different florals to create an entirely new perfume blend. Even flowers that have no scent, like orchids, can have a beautiful, long-lasting fragrance this way. Now if we could only keep them from wilting.