Poinsettias are an easy plant to keep. This type of plant needs to be outside or in a room that gets plenty of sunlight. The temperature should be between 60 and 70 degrees Fahrenheit, with few drafts.
While the amount of time varies, many poinsettia plants last after December and often up until February. Since they don't like shade or drafts, try to keep them near a heated appliance, such as a fireplace or furnace vent. After first getting the poinsettia, water it until the soil is wet. Wait for the soil to dry before watering it again. If the plant dries out, simply keep watering it until it grows healthy again. Try to keep it outdoors on warm days.