Tip for keeping hydrangeas from wilting - Bring 2 cups of water to a boil in a medium sauce pan & then pour the water into a cup or other container. Let it cool for a minute & then get ready to dip the hydrangea stems into the boiled water. This removes a sticky, sap like substance from within the stem that may block the stems ability to take in the water. Place in boiled water for 30 sec, then back in your vase with room temp water.