Its the amount of light they get. The days get shorter they start thinking its time to bloom, the bracts turn red, or whatever color they are meant to be.
What causes poinsettia plants to become red during Christmas time?
Its the because of the shorter time of sunlight during the winter that cause that and also the drop in the temperature. If you have a green one go put it a dark closet for a couple of hours during the day , and it will change to red. Also remember poinsettia are very poisonous to aminals and small kids.
Reply:Genetics. No, they are not poisonous, as previously thought.
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