Dkskater, I don't think anyone would want to risk a nute deficiency, or shock just to turn them purple necessarily. I was just responding to the comments. Though in the last 2 weeks of flower, the plants aren't usually getting many nutes from the soil I don't believe. Though they do put on alot of wieght in the last 2 weeks, and it would be ashame to stress the plants, and reduce the production, or quality. My feelings, are unless the plant is outdoors, where temps are some what out of our control, or it is a strain that naturally puts on color as it buds, I don't believe in trying to change the color of the plant, at the risk of the crop.