Two of the top questions Americans ask when purchasing flowers are "How do I take care of them?" and "How long will they last?"
For floral arrangements... Keep the vase filled or floral foam soaked with water containing a flower food. If the flower food solution becomes cloudy, replace it entirely. If possible, recut stems by removing one to two inches with a sharp knife. Use warm water when adding water to the vase or refilling it.
Keep flowers in a cool spot (65 to 72 degrees Fahrenheit), away from direct sunlight. Avoid heating or cooling vents, areas directly under ceiling fans, or on top of televisions or radiators. Appliances such as televisions and radiators give off heat, causing the flowers to quickly dehydrate.
For boxed flowers or loose wrapped bunches... If you can't get your flowers into a water and flower food solution right away, keep them in a cool place. Fill a clean, deep vase with water and add the flower food, following the directions on the package.
For all arrangements... Remove any leaves that will be below the waterline. Leaves in the water will promote bacterial growth, causing the flowers to wilt quickly.
Recut stems with a sharp knife. Do this underwater, in warm water. This allows the stems to draw in water instead of air. Then place the flowers in the vase solution you've prepared. When using woody stems and branches (such as forsythia, quince or lilac), cut the stem with sharp pruning shears.