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Humboldt Nutes has a new expensive product that is suppose to make plants purple. I have never tried it and probably never will, I bet its just purple kool aid. JK
I'm a great snake-oil detractor and I will say on the record... I USE SNOWSTORM!!! WITH GLEE!!! It not only makes genetically predisposed plants go true purple, but lends them a more crystally look- after the first couple foliar feeds of the stuff, next time I went into my flower room I was like OMG WTF! (well, not quite like that hahaha). The frosty factor had imporved big time, and my Kenai thunderfuck had turned a lovely plum color. Pic attached, bottom LH corner. That's The Yeag's Matanuska Thunderfuck, from Soldotna on the Kenai. I've been growing her for a year and a half and never seen the purple before. Rock on. I didn't have such good luck with their 'gravity' though...