Molybdenum Deficiency From what i have all read i’m thinking this any run ins?
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That looks like flower and color fade sometimes I get really purple sometimes they get reddish usually starts after a few cool nights. I don’t know 
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I almost think because i just added kelp 1-0.5 -2 three days and organic bloom fertilizer 3-9-4 in soil not cocoa PH6.5 and might of run a gallon of water around 6.0 which could always be off and lower than 6 none of my others are doing this
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What’s the temp in the grow night and day?
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See the purple stem. That shows stress. Cold stress at the end of seasons can cause color changes.
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I want to say it looks like not enough “P” and maybe even a little cal mag. This is why i use roots organic hp2 its a liquid guano. I feed my plants calmag every day and roots organic surge everyday. The entire life of the plant.
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I’m also in the temp Q, my experience with purp phens…cool temps make em show more. Otherwise not knowing, I’d lean Mg/P if your pushing those lights, but really looks Phen/temp without knowing your grow.
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