If your garden is overflowing with beautiful blooms that you want to bring indoors for the ambiance, you can keep these fresh at least a week longer by filling the vase with 1 liter of lukewarm water, add 2 tablespoons of lime juice, 1/2 teaspoon of bleach, and 1 tablespoon of sugar. Stir this, and place your flowers in the vase. The lime juice optimizes the pH level in the water, the bleach prevents the bacteria growth, and the sugar adds the nutritional boost the flowers need to survive longer.