![Florist Chuck Knoll of Walter Knoll Florists, carries oversized poinsettia flowers for checkout on Poinsettia Day in St. Louis on December 12, 2018. Joel Roberts Poinsett introduced the poinsettia plant to the Florist Chuck Knoll of Walter Knoll Florists, carries oversized poinsettia flowers for checkout on Poinsettia Day in St. Louis on December 12, 2018. Joel Roberts Poinsett introduced the poinsettia plant to the](https://c8.alamy.com/comp/W087J0/florist-chuck-knoll-of-walter-knoll-florists-carries-oversized-poinsettia-flowers-for-checkout-on-poinsettia-day-in-st-louis-on-december-12-2018-joel-roberts-poinsett-introduced-the-poinsettia-plant-to-the-united-states-from-mexico-in-1825-poinsett-was-a-botanist-physician-and-the-first-united-states-ambassador-to-mexico-the-colorful-plant-is-popular-from-thanksgiving-to-christmas-photo-by-bill-greenblattupi-W087J0.jpg)
Florist Chuck Knoll of Walter Knoll Florists, carries oversized poinsettia flowers for checkout on Poinsettia Day in St. Louis on December 12, 2018. Joel Roberts Poinsett introduced the poinsettia plant to the
![Florist Chuck Knoll of Walter Knoll Florists, inspects a poinsettia flower that has been treated with an enzime that creates white spots on the flower on Poinsettia Day in St. Louis on Florist Chuck Knoll of Walter Knoll Florists, inspects a poinsettia flower that has been treated with an enzime that creates white spots on the flower on Poinsettia Day in St. Louis on](https://c8.alamy.com/comp/W087JK/florist-chuck-knoll-of-walter-knoll-florists-inspects-a-poinsettia-flower-that-has-been-treated-with-an-enzime-that-creates-white-spots-on-the-flower-on-poinsettia-day-in-st-louis-on-december-12-2018-joel-roberts-poinsett-introduced-the-poinsettia-plant-to-the-united-states-from-mexico-in-1825-poinsett-was-a-botanist-physician-and-the-first-united-states-ambassador-to-mexico-the-colorful-plant-is-popular-from-thanksgiving-to-christmas-photo-by-bill-greenblattupi-W087JK.jpg)
Florist Chuck Knoll of Walter Knoll Florists, inspects a poinsettia flower that has been treated with an enzime that creates white spots on the flower on Poinsettia Day in St. Louis on
![Florist Chuck Knoll of Walter Knoll Florists, carries oversized poinsettia flowers for checkout on Poinsettia Day in St. Louis on December 12, 2018. Joel Roberts Poinsett introduced the poinsettia plant to the Florist Chuck Knoll of Walter Knoll Florists, carries oversized poinsettia flowers for checkout on Poinsettia Day in St. Louis on December 12, 2018. Joel Roberts Poinsett introduced the poinsettia plant to the](https://c8.alamy.com/comp/W087J3/florist-chuck-knoll-of-walter-knoll-florists-carries-oversized-poinsettia-flowers-for-checkout-on-poinsettia-day-in-st-louis-on-december-12-2018-joel-roberts-poinsett-introduced-the-poinsettia-plant-to-the-united-states-from-mexico-in-1825-poinsett-was-a-botanist-physician-and-the-first-united-states-ambassador-to-mexico-the-colorful-plant-is-popular-from-thanksgiving-to-christmas-photo-by-bill-greenblattupi-W087J3.jpg)