They also have this great 7 day freshness guarantee. I guarantee you' ll love it. Always cut stems at an angle with a sharp knife or scissors. On thick stems split the ends before placing in water. Cut stems under water to prevent air bubbles entering the stems.
Air bubbles can stop the free flow of water into the stem.
Remove leaves below the water line. Decaying leaves poison the water. Refrigerate flowers at night. This will double their life span. A good preservative for flowers is 2 tablespoons of white vinegar and 2 tablespoons of cane sugar to a quart of water.