anybody know whats causing this on the top of my plant? environment is where it needs to be for ph ppm humidity and temp.
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Looks to me like your plant is craving some phosphorous. The demand goes up when it starts flowering.
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Or the temps are cold.
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I’m not seeing any of the other growth affected, leaning towards some natural coloring. What’s your grow space temp average? @Low is absolutely on point with your stage of flowering needing a little more PK 
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If it’s temp I’ll be envious. My spaces over winter was fluctuating 20° F day/night with no real change in color, aside from what I’d assume is genetics. Or maybe I’m just greedy and wanted more. LOL. One day!
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Winters are my best runs but only got the Purple Kush to come out this time
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Love it. I’ve absolutely loved the humidity. 
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@Low I’ll be sure to give her a good dose then her next feeding thanks for the info 
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@OGIncognito the daytime is 78 to 80 and lights off 70 to 72
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if it helps at all it’s a cream autoflower plant
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Just the plant’s “fall” plumage
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Just winter colors. P/k is good now. All 3 i just harvested had a ton of purple. Yellowing and leaves dieng worry me more than purples.
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@VirginiaGrowBoy wow those look amazing, and that purple coloring is awesome
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