Apple Cider Vinegar
Make your own preservative to keep cut flowers fresh longer. Dissolve 3 tablespoons sugar and 2 tablespoons white vinegar per quart (liter) of warm water. When you fill the vase, make sure the cut stems are covered by 3-4 inches (7-10 centimeters) of the prepared water. The sugar nourishes the plants, while the vinegar inhibits bacterial growth. You'll be surprised how long the arrangement stays fresh!