Keep Your Cool - Before placing cut flowers in a vase, store them in a cool place.
Keep it Clean - The container and your cutting tool (knife, serrated shears or floral clippers) should be clean, since cleanliness does affect the presentation and life expectancy of cut flowers. Wash the container and tools with a detergent or antibacterial cleaning solution. Be sure to rinse well.
Feed Your Flowers - Commercial flower food will prolong the life of your bouquet. Be sure to carefully follow the mixing instructions on the packet. Adding too much water can dilute the solution's effectiveness.
Keep it Trim - Recut stems with a sharp knife or floral clippers. Hold them under water and cut away 1 to 2 inches. Trim away any leaves that will fall below the water line. Bacteria growth caused by submerged leaves will reduce the amount of water the flower can absorb and shorten its enjoyment time.
Location, Location, Location - Keep fresh flowers out of direct sun and away from drafts and heat-generators like windows, air conditioners, vents or fans and appliances.