How unusual! I am not sure where you live, but, the poinsettia flowers usually go away with the season of Joy. Here is what I could look up for you. If yours is still blooming, congratulations!

Do poinsettia come back every year?

Poinsettias can be kept year after year, and they will bloom each year if you give them proper care. When the leaves begin to yellow or when the plant is no longer desired as an ornamental, gradually withhold water. ... After all the leaves have fallen, store the plant, in its pot, in a cool (50 to 60°F), dry, dark area.

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