Hi,

I’m afraid it’s very difficult to get a poinsettia to turn red again even if you follow all of the rules on how to do it. Poinsettias are photoperiodic plants and start to develop flowers as nights become longer and days shorter. Starting October 1, Poinsettias need complete darkness for 14 continuous hours each night if you want them to bloom for Christmas. Any stray light at all, such as a tiny night-light or a streetlight, can delay or totally stop the blooming process. You may have to move your Poinsettia into a closet or even put a box over it to attain total darkness. During the day place your Poinsettia in very bright indirect lightVery few houseplants should be placed in direct sun. High light refers only to bright indirect light since direct sun often burns the leaves of indoor houseplants. An area that is too hot and dry encourages Spider Mites and causes blooms to quickly fade. A northern exposure really doesn't provide enough light for high light plants. These plants need to be placed directly in front of an east-facing window, within 1-3 feet of a west-facing window, and within 5 ft. of a south facing window. A high light area has over 300 ft. candles of light.. The temperature at night is also crucial and should be between 60-70 degrees for the buds to properly set. This regime needs to last for 8-10 weeks if you want your Poinsettia to bloom at Christmas.

Sorry, but it’s not going to work for you this year.