Same here, Mine get that, never worried about it.I've seen this in a few of my plants before and I've never seen it be a problem. The plants were healthy and great smoke. I truly believe it's strain and pheno related. I also did some research and other growers have experienced the same thing. Even with the same clones from the same mother being grown inside and outside by different growers and the plants did exactly the same with the purple stems and veins.
I wouldn't worry about it. Keep them healthy and rock and roll. Judge the smoke for yourself. I think you will find it's just a Pheno thing.
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