Wash your vase in hot soapy water, making sure to scrub the insides to remove any built-up residues. Alternatively, run your vase through the dishwasher. Rinse with clear, hot water.
Soak vase for a few minutes in a solution made by combining 1 cup of bleach with 1 gallon of water. Wipe your cutting blades with some of this solution.
Fill the clean vase with a solution made of 1/2 tsp. pf bleach for every pint (16 ounces) of water.
Take roses from their packaging or temporary container. Place them on a counter or other work surface.
Trim off any leaves that will be below the vase's water level.
Cut the stems at an angle at a point that is roughly 3/4 inch from the end. Immediately place them in the vase.
Change the water in the vase every day. Replenish it with bleach at the rate of 1/2 tsp. to 16 ounces of water.
Place the vase of roses in a cooler spot at night or in the refrigerator.