Despite their limited, two-month run on retailers’ shelves each year, poinsettias are the best-selling potted plant in the United States. Growers sold more than 34.6 million plants in 2014 alone with 2015 being an even more productive growing and selling year. Called cuetlaxochitl by Native Americans, the woody shrub to small tree is native to the tropical areas of southern Mexico and Central America.