This coleus was outside during the summer. It was in a spot which received shade almost all day. Believe it or not, it was a gorgeous deep maroon color. I brought it in before frost, and potted it in brand new potting soil. It sits in a western exposure, and because I thought it needed filtered sunlight, I only open the blinds a little bit. After two months indoors, it turned green. And now, two months later, the new growth is light cream. What can I do to bring back it's original beauty ? Thanks.