how do you keep cut flowers fresh longer?

To keep your cut flowers fresh, focus on these simple steps:

• Trim the stems: Cut about an inch off the bottom of the stems at a 45-degree angle. This increases the surface area for water absorption and prevents the stem from sitting flush against the bottom of the vase.
• Remove submerged foliage: Strip away any leaves that will sit below the waterline. Leaves left in water will rot, promoting bacteria growth that shortens the life of your flowers.
• Use flower food: The packet included with most bouquets contains sugar (energy), acid (to lower pH for better water uptake), and bleach (to inhibit bacteria). If you don't have one, a tiny drop of bleach and a teaspoon of sugar in the water can help.
• Change the water: Refresh the water every two to three days. This prevents bacterial buildup and keeps the stems clear.
• Keep them cool: Place your flowers in a cool spot out of direct sunlight, away from heat vents, and—crucially—away from ripening fruit (which releases ethylene gas that causes flowers to wilt prematurely).
• Recut periodically: Each time you change the water, trim a tiny bit more off the stems to keep the "straws" open and drinking efficiently.