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Poinsettias require short days and long nights in order to bloom and for their bracts to turn color. They need total blackness if possible; you don't even want the light from the moon or stars to enter the room where the poinsettias are being kept.

It will take a while but the poinsettias will turn red by doing this.

(http://www.howtodothings.com/home-garden/how-to-make-a-poinsettia-turn-red)

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