Occasionally, you may have to keep cut flowers overnight for arranging or gifting the next day. You'll want those flowers to look freshly picked. By caring for them properly overnight, you can keep your bouquet looking fresh and new. The process takes a little know-how and a few materials, but the results are worth the effort.
Fill the vase with lukewarm water, leaving about 1 inch at the top.
Pour floral preservative into the lukewarm water. Follow the manufacturer's instructions and add the amount recommended for the size of your vase.
Cut an inch of stem off each flower, using sharp scissors. The cut should be at a 45-degree angle to allow as much water into the stem as possible. Also, an angle angle cut makes it less likely that the stem will rest completely on the bottom of the vase, blocking water intake. Cut each stem under water to avoid creating an air bubble in the stem; bubbles also can block water intake.
Place your vase in a cool location, around 40 to 45 degrees Fahrenheit, with low or no light. Basements and porches are ideal places. If your flowers are tropical, such as orchids, the storage temperature should be about 5 degrees Fahrenheit warmer.