Place potted poinsettias indoors in indirect light. Six hours or more of light (natural or fluorescent) is best. Keep them comfortable, ideally between 65 and 75 degrees, day or night. Lower temperatures will make them drop leaves almost immediately and shut down.
Plant them in a sunny, well-drained location protected from north winds and frost. The south side of a house or wall is usually a good spot. Make sure the location receives no artificial light at night from flood lights, street lights or porch lights, as this can prevent poinsettias from blooming properly.
In your home, put the poinsettia in a well lighted area away from drafts and heat vents. Water the poinsettia when the pot becomes lightweight or when the soil becomes dry to the touch, about once a week.
Because poinsettias are tropical plants, they do require some sunlight. But, placing the plant in direct sunlight can cause damage to the plant’s leaves. Extreme low or high temperatures and drafts should also be avoided.