Cut stems straight across or slantwise using flower cutters or a sharp knife. Cut stems under water that is fresh, clean and warm (100 to 110° F). Garden flowers and tropical flowers should be cut in tepid water (80 to 100° F).
Transfer cut flowers to a container filled with water of the appropriate temperature. Remove any foliage that will be below the water line.
If you are using preservatives to prolong the life of your flowers, follow package directions. Add water to the container as needed and replenish the solution every 1-2 days. If you're not using preservatives, change the water, thoroughly clean the container and re-cut stems daily.
Place arranged flowers in a cool place, especially at nighttime. Keep away from heat, drafts and air conditioners.
If the flowers are arranged in floral foam just add water daily. The foam itself is a preservative. Place in a cool area away from heat and drafts.