Begin processing flowers as soon as you receive them.
Mix flower preservative in a clean container (preferably glass or plastic instead of metal) according to package instructions using the correct amount of warm water.
Carefully remove foliage that will be under water in the container.
Re-cut stems with a sharp knife or floral cutters (try to avoid scissor as this can crush the stems instead of creating a fresh drinking surface).
Arrange flowers in a container with enough space that air can circulate properly( tight packed flowers will prematurely rot).
Flowers displayed in a cool location will always last longer. Keep them out of direct sunlight, and away from extreme temperatures caused by radiators and air conditioning units.
Try to keep flowers away from fruits and vegetables as they produce a gas called ethylene. (Ethylene promotes fast deterioration and a shorter life for the flowers).
Check water levels in the container daily and add more water when it gets low. Dump out old water and mix a fresh preservative solution if flowers last more than one week (or if water turns murky).
Re-cutting approximately ½ inch off stems every couple of days helps remove any air blockages that may occur.
Remove wilted flowers and leaves daily to help remaining flowers last longer.
Scrub container after use with bleach (or a strong cleaner) and hot water. Do not simply rinse out with plain water because harmful; bacteria will not be removed