Scientific American: Roses are red… They are also fragile and almost always flown to the U.S. from warmer climes in South America, where roughly 80 percent of our roses take root; to warm the hearts of European sweethearts, they are most often imported from Africa. They are then hauled in temperature-controlled trucks across the U.S. or the Continent and locked up overnight in cold boxes before their onward journey to the florists of the world. According to Flowerpetal.com, which tries to limit the …