I have had poinsettia for years. By this time they would have fallen off leaves and all, and thrown in the trash. I have had this plant since December 2015. Have it next to a window, which gets sunlight from 3pm to about 6pm EST. Live in Pennsylvania area. My question is I give it water from a bottle, when it needs it. I have not lost one single bloom, or one single leaf on it. It is in the same pot that it was in when I got it. Everything that I have read on it tells me the blooms should have fallen off, and even the leaves. It is April now and they are still there. What is going on? I do change the plant around so that one side is not facing the light about every week.
It is possible for you Poinsettia to continue blooming into the Spring.
Here is an article with more information.