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How do you get a poinsettia to change colors?

I bought 2 poinsettias last Christmas, and I've been able to keep them alive & healthy throughout the year. Now that it's November, what do I have to do to get them to start changing back to red & pink in time for this Christmas?

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Hey, I've actually been wondering the same thing as well, so I can't honestly say that I know too much about poinsettias. I did find a site with a few basics on poinsettias, and how to get them to change color. (This is directly from the site):

"Q: How do you get a poinsettia to bloom?

A: From the first of October until the colored bracts can be seen it should not receive any light at night. Cover the plant at dusk every evening with a light-proof bag and uncover about 8:00 AM in the morning. A closet may be ideal to put it in at night. Even a quick, short exposure to even dim light can prevent flowering."

http://aggie-horticulture.tamu.edu/plantanswers/flowers/poinsettia.html

Anyways, hope this helps, and best of luck to you!