There are a number of ways to keep cut flowers staying fresh. Change the water every two days. It is important to recut the flowers on a slant (about 3 cm) as this will expose more of the stem to water. Remove any leaves that will be in the water. The flowers should be placed in luke warm water. Use cold water for bulb flowers such as hyacinths, tulips, and daffodils. Add flower food to the water. Your vase should not contain any residue which can be a haven for bacteria that can cause flowers to wilt. The lower the temperature of the room, the longer the flowers will last. Enjoy your fresh arrangement!!