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Being as I live in the Northwest, the temperatures are beginning to get pretty chilly at night. I noticed when I had my plants on a timer for veg (18-6) they were getting too cold. The stems began to show purple colors, and the edges of the leaves did the same thing. I was wondering what the most effective way to heat the plants during flowering. During the day, when I plan to have my lights off, the temps often drop to 30-40 degrees F. The room where they are located is a small, back closet that has direct air circulation to the outside.
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