Poinsettias are tropical/sub-tropical plants. They need equal hours of daylight and darkness to flourish and produce the red bracts that make them so popular at Christmas. When I lived almost on the Equator, I had a huge one in my garden - taller than me - which needed no encouragement. I could cut bits off it, stick them in the ground and they would grow. So, Jayh, you can keep it alive and green, but I think you are doomed to disappointment if you want it to bloom. It's so much easier to buy a new one each Christmas. By the way, if you break or cut off any twigs, don't touch the white sap - it;s very corrosive and irritant.