Flowery History Though they have been grown in Europe for well over two hundred years, Dahlias are thought to originate in Mexico and are that country’s national flower. Dahlias are believed to have been named by 18th-century Spanish botanist Abbé Cavanille in honor of Andreas Dahl, a Swedish scientist and environmentalist. Petals or Florets? Dahlia florets are often mistakenly called petals...