If the flowers look tired, float them in a sink or tub filled with cold water for three to four hours to rehydrate them.
Fill a very clean vase halfway with fresh, cold water. Add the included cut-flower food, then arrange the hydrangeas in the vase. Use sharp pruners to recut the stems at a 45-degree angle to help them draw more water. It helps to refresh your hydrangeas every one to two days to keep them fresher, longer. Recut the stems, change the water, and add nourishment. Use the extra pack of cut-flower food with your first change of water.