The happier homemaker has advice on keeping your cut hydrangeas fresh longer. I love the flower but it does usually wilt very quickly once cut.
She has a secret item to help keep the stems from sealing shut to prevent the blossoms from getting water. This is very cool. I wonder if it will work on other blooms as well.
http://www.thehappierhomemaker.com/2013/05/the-secret-to-long-lasting-hydrangeas.html