Your honey bought you a Valentine’s bouquet (sweet!). Make those cut flowers last longer with these simple steps from Kate Law of proflowers.com:
Fill a vase with lukewarm water and add the included flower food. Cut off stems on an angle with a sharp knife to create more surface area for the water absorption. Place the vase out of direct sunlight in a cool, non-drafty spot. (Related: Make a Valentine’s Day Vase)
Refresh the water and trim stems 1/2 inch every other day. In place of flower food, fill the vase with half water, half lemon-lime soda—the sugar will feed the blooms while the acidity will keep flower-life-shortening bacteria at bay.
source: Good Housekeeping