The theory: The copper can act as a natural antibacterial agent.
Day 1: A penny is added to the water.
Day 4: The flowers open and look a little droopy, but the dark tangerine color is still strong.
Day 7: The stems are heading in every possible direction, but the blooms have opened up in a fairly regular pattern. (See photo, left.)
The verdict: The flowers were slow to bloom, bloomed beautifully, then withered quickly.