Poinsettias originate from Central America. As a result they do not live in temperatures below 130C. This highlights why you must be careful when moving your poinsettia from your car into your house during freezing conditions. If the plant gets frost exposure it will not recover. Keep them in a warm sunny position at around 200C – free from cold exposure and drafts. Ideally they prefer humid conditions with moist soil and this can be replicated by placing a pebble dish under the pot.
After flowering they can be kept for the following year but trying to keep the plant all year round is tricky and usually requires ideal glasshouse environmental conditions. They require certain light levels and certain temperatures to flower and provide beautiful showy bracts. They are hungry plants that will need fed weekly and like rich soil that is free draining.