Why is the Poinsettia plant part of Christmas tradition? It is named for Joel Poinsett (1779-1851), American Ambassador to Mexico. While traveling the Mexican countryside, he was struck by a beautiful plant he found growing there. He brought it with him to his South Carolina home, where its popularity spread. Its read leaves remind us of the blood of Jesus, shed on the cross for us. His atoning love now transforms all who trust Him as their Lord.