Native to Mexico, poinsettias are named after Joel Roberts Poinsett, the first U.S. ambassador to Mexico, and became popular in the United States in the 1850s. Poinsettias became associated with Christmas around the 17th century because of their red and green color and their resemblance to a star, symbolizing the Star of Bethlehem.
There is a common misconception that poinsettias are poisonous to humans and pets. Research has shown that, while poinsettias can cause stomach irritation resulting in diarrhea and vomiting, they are not poisonous.
Since poinsettias are not toxic, you can safely add them to your compost pile. Poinsettias, while long-lasting, were not bred to be a perennial plant. Rather than throwing them away, composting them is a green alternative to sending them to the landfill.