Poinsettia Day
Poinsettia Day is held on December 12. Euporbia pulcherrima is discovered in 1828 by Joel Roberts Poinsett. This event in the second decade of the month December is annual. 
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Contrary to popular belief, poinsettias are not poisonous. Poinsettias are native to Mexico. Poinsettias aren't always red. The showy, colorful part of the poinsettia isn't a flower – it's a modified leaf. Poinsettias need both sunshine and dark nights to bloom.
In Spain the Poinsettia has a different holiday attribution. It is known there as "Flor de Pascua", meaning "Easter flower". Poinsettias have also been called the lobster flower and the flame-leaf flower, due to the red color. Poinsettias received their name in the United States in honor of Joel Roberts Poinsett, who introduced the plant into the country in 1828.
Similar holidays and events, festivals and interesting facts
Mason's Day in Argentina on December 11
National Ding-a-Ling Day in US on December 12
Violin Day on December 13
International Monkey Day on December 14 (The unofficial international holiday was created by artists Casey Gore and Eric Millikin to spread knowledge about animals and to show them care and love);
Christmas Jumper Day on December 14
Cat Herders Day on December 15 (This is a day for everyone who has to face the frustration of trying to manage the unmanageable);
World Otaku Day on December 15 (a person who is passionate about something)