Would you say there is a problem here? Plants seem to be happy and progressively growing. I’ve noticed over the past couple days the stems turning purple.
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Nothing to worry about! Nice grow you got 
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Some strains have purple stems, I can think of a hashplant that is very purple. Its primarily an indica trait though, never seen purple leaf stems on traditional sativas?
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Most led grows have the purpling. Mine does.
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I believe that was from water splash…at least I hope