Poinsettia Care Tips that describes what to do.
Poinsettias are beautiful at this time of year due to being forced in commercial greenhouses. If you want to save yours for next year, you will also need to take measures to force bloom in time for the holidays (it's a little tricky, but here's how if you're interested). Did you know that the red parts are actually bracts (modified leaves) and that the true flowers are the little yellow parts in the centers? You can also plant them outdoors with protection from frost. They have been seen growing as tall as eight feet in San Jose, and taller in their native Mexico.