Actually poinsettias are fairly easy-care durable houseplants. They are just a pain to bloom again. I have one that is, oh, 8 or 9 years old. It's about five feet tall and a pretty plant with those bright green leaves and reddish stems. It's full and bushy and I use it much the same way I would a ficus (and it's not nearly as prone to dropping leaves). I just don't try to bloom it again. Did it once, about 8 or so years ago, and it worked, but was a pain to do it. Now I just let it grow.

Found this on web site: gardeningknowhow.com.
Hope this help. I bought big poinsettia this year and playing to keep it as indoor plant going forward.

From the net:

How To Make Poinsettia Turn Red – Make A Poinsettia Rebloom

What Makes Poinsettias Turn Red? Many people wonder what makes poinsettias turn red. It is actually the plant's leaves that provide its color through a process called photoperiodism. This process, in response to certain amounts of light or lack thereof, turns the leaves from green to red (or pink, white, and other shade variations). What most people mistake as flowers in fact specialized leaves, or bracts. The small yellow flowers are found in the center of the leaf branches. How to Make Poinsettia Turn Red In order to get a poinsettia plant to turn red, you need to eliminate its light. Flower formation is actually triggered by periods of darkness. During the day, poinsettia plants require as much bright light as possible in order to absorb enough energy for color production.

At night, however, poinsettia plants must not receive any light for at least 12 hours. Therefore, it may be necessary to place plants in a dark closet or cover with cardboard boxes. Make a Poinsettia Rebloom To coax a poinsettia plant to bloom again, it's necessary to repeat the poinsettia life cycle. After the holidays and once blooming has ceased, limit the amount of watering so the plant can go dormant until spring. Then, usually around March or April, regular watering can be resumed and fertilizing can begin. Prune back the plant to about 6 inches from the top of the container and repot. Poinsettia plants can be kept outdoors in a protected sunny area during summer, if desired. Pinch out the tips to promote branching of new growth until about the middle of August. Once fall returns (and shorter days), reduce the amount of fertilizer, and bring outdoor plants inside. Once again, limit watering in September/October and give the poinsettia bright daylight temperatures between 65-70 F. (16-21 C.) with total darkness at night with cooler temperatures of around 60 F. (15 C.). Once flower bracts have developed definite color, you can reduce the amount of darkness and increase its water.