The flower for Christmas is the Poinsettia. It's a beautiful red and green plant that's often used as a decoration during the holiday season. It's named after Joel Roberts Poinsett, the first U.S. ambassador to Mexico, who brought the plant back to the U.S. from Mexico. The flower is also known as the "Christmas flower" because of its association with the holiday. It's a symbol of the season's warmth and cheer.