Do you treat your Christmas Poinsettia as an annual, and throw it way when it finally loses all those beautiful bracts, or do you care for it, baby it, and suffer its dormancy in order to bring it back into glorious bloom next December? Can you guess which approach I take with a Christmas poinsettia? I'll give you a hint. This is my second poinsettia, a gift from my husband. I left my first one in the car.…