Use clean containers. You can disinfect vases with about one-quarter teaspoon of bleach in a quart of water. Then rinse well. If you don’t like working with bleach any household disinfectant works well (equal parts with water).
Keep your flowers out of direct sunlight, and away from cold drafts or heat sources such sunlight or forced-air heat vents. As with many cut flowers, cool room temperatures are ideal for longest life.
Use an appropriate vase. Make sure you are not crowding the vase either; when in doubt you can always make two bouquets out of one. The vase needs to be about 1/4th full with water.
CHANGE WATER EVERY DAY. Cut one inch of the stems (every other day) under running water to keep air from getting into the stem openings and clogging the water vessels. As with other cut flowers, make sure leaves are removed that would be underwater.
Do not forget to add floral preservative. You can use the little pouch provided two times. First on day 1 then when you first cut the stems. And then after 2/3 days
Avoid heat, direct sunlight, windows, and even fruit. Flowers will last longer in a cooler room and if you keep them out of direct sunlight. Avoid placing them near appliances that generate high or low temperatures like the stove, air conditioner, ceiling fans, and even your computer or TV. Open windows will also cause them to dehydrate more quickly, and keep them away from fresh fruit which releases tiny amounts of gas that can cut the lifespan of your blossoms
Bouquet tip:
Are you afraid that cutting stems will disturb the flower placement in a beautiful arrangement? A quick tip is to tie the stems with twine just above the vase’s edge before taking them out for a cut. Make sure to hold the tied arrangement firmly as you re-cut the stems. After you are finished, place the arrangement back into the clean vase (remove the twine) and refill with fresh water