My plant is turning purple, wtf

My plant, now a week away from harvest has started developing purple tips on the leaves as well as the pistil pods, i know its not purple bud because i have another girl from the same seed that is a solid green, plus it started turning color almost at the end of its life, what does this mean?

means it's getting cold.......



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yup thats what they look like, yeah and there was a frost about a week ago, thats probably what did it. thanks for the info

wow mine arent even doing that and im in Canada, i have a igloo over my plant keeping it warm so thats probobaly why