Pick blossoms just as they're barely open at 9 or 10 am, and slip each one into an empty Sno-Cone cup to protect it. (Pick them right under the flower rather than at the base of the stem in order not to tear the bark.)

Put the Sno-Cone cups containing the flowers in a plastic bag and place them in the refrigerator for the day.

Take the flowers out in the evening. They'll stay open all night without water.

Because water is not needed, you can use these methods to arrange them. Spear the blossoms on toothpicks, and stick the toothpicks into arrangements. Or, to use the flowers in vases, spear them on long bamboo barbeque skewers and arrange the skewers. Or instead of the stiff bamboo skewers substitute the center veins of fronds cut from a pigmy date palm (Phoenix roebelenii). Cut off the individual leaflets from each vein so it becomes a bare stem before spearing a flower with its sharp tip. Your hibiscus will be transformed into cut flowers with long, graceful, arching stems.