Fresh-cut flowers have less than a week's lifespan under typical conditions. Fortunately, you can employ some quick and easy techniques to keep flowers fresh longer, for up to a week or more. Fresh flowers can require more care in summer, as humid conditions limit their shelf lives. Protect cut flowers by keeping them away from windows and out of the sun during warmer months. At any time of the year, keep flowers away from heating or cold air vents, ceiling fans and the tops of TVs or radiators.
Use clean disinfected tools when cutting flowers. Only place flowers in clean disinfected vases.
Add a flower preservative, available from florists, to the water in the vase or make your own by combining one part lemon-lime soda to three parts water.
Place flowers in cold water rather than warm, which tends to dry out flowers.
Set freshly cut flowers in the refrigerator for six hours to extend their lives before placing at room temperature.
Cut stems daily at a 45-degree angle under running water to open up the stem for more water penetration.
Remove dying leaves and foliage daily under the water line.