Native to Mexico, the plant is called Flor de la Noche Buena (Flower of the Holy Night) due to its resemblance to the Star of Bethlehem. 

In their native region of southern Mexico, poinsettias flower during the winter season. It’s a perennial shrub that was once considered a weed and will grow 10 to 15 feet tall in the wild. The Aztecs used the poinsettia bracts to make a reddish-purple dye for fabrics and used the sap medicinally to control fevers. The colored “flowers” are specialized leaves called bracts, while the actual flowers are inconspicuous beads found in the center of the bracts.

According to Mexican lore, a young child, Pepita, did not have a gift for the baby Jesus at a Christmas Eve service. She was penniless, so all she could do was pick a bouquet of weeds to offer. The angels felt compassion for her plight. So, after Pepita set the flowers at the crèche of the nativity on Christmas Eve, the angels transformed the weeds into beautiful red flowers. This is why red and green are the colors of Christmas today.