Some plants simply sit quietly on windowsills. The poinsettia? It demands the spotlight. Bright, bold, and as red as Rudolph"s nose, this December diva even has its own holiday—National Poinsettia Day, celebrated on December 12. Prior to becoming a popular Christmas decoration, this shrub had quite a journey. Long before it appeared in living rooms, it grew wild in Mexico, where the Aztecs used it for dyes and medicine. Then, in the 1820s, US diplomat Joel Roberts Poinsett spotted the plant, fell for its charm, and sent it home. The rest, as they say, is history—and botany.