I've been planning on DIYing my centerpieces. I picked up a couple stems of the flowers I want to use from the florist we're using for the bouquets so I could try to make a mock up. It came out looking fantastic, but my infamous "black thumb" struck and the flowers looked pretty sad after about 12 hours. My mom had suggested maybe adding a preservative, either one to the water or one that you can spray over the flowers themselves. I was wondering if anyone else had used a preservative, what you used, and if you had any suggestions?