When shopping for your plant this year make sure you bring your poinsettia directly home. They don’t like to be chilled in the car while you make one more stop, even in mild temps. And when placing them in your home avoid drafty areas near doors as well as heat sources like vents and fireplaces!
Since they come with decorative foil pot covers they are easily over watered. My *secret* tip to keep them evenly watered is to put a couple of ice cubes in the pot every few days. The ice cubes melt gradually helping you avoid over watering them!