A flower that looks almost coal-black as a bud and then slowly turns deep red as it opens is growing on the banks of the Euphrates River in Halfeti, a small district in southeastern Turkey, and no lab, dye or genetic trick has anything to do with it. Locals call it Karagül. The rest of the world knows it as the Halfeti black rose, and it has been pulling in tourists, botanists and flower collectors for well over a hundred years.
