Red stems

[RootedSwamp]

I run coco but it also happens in jiffy peat pellets & root riot when I clone. I get these purple stems, I’m wondering if it’s the humidity while the dome is closed the humidity is 75-85 RH but it also happens in veg with most of the strains i run like Jack the Ripper, fist bump. Some strains like my 80’s Durban don’t turn purple as quick and are less purple. I run ac infinity in a 2×4 with 2 oscillating fans. I wonder if the fans are the issue or is it the nutrients? I’m still using the same 2 bottles of VIVOSUN veg nutrients I got a few years ago & some recharge. I charge my coco with cal mag but maybe i need more cal mag oh my ph pen are the cheap $20-$30 not the real cheap $10 ones every company seems to have. My PH is 5.5 – 6.3.  This summer I got my 1st battle with fungus gnats (my lady lets outside cats come in and have kittens & gnats followed) but I got them under control with Mosquito dunk bits, sticky traps (learned that from you) plus I have a pool so I have plenty of diatomaceous earth but even before the fungus gnats I had red stems sometimes it started during the flower stretch I was gonna asked nik from rooted leaf but I thought I’d ask you 1st since you have interviewed so many people and studied this stuff. Plus you helped me a lot when I 1st started growing indoors. My question why do I keep getting red stems?

[jaymoney]

Purple color is anthocyanin, and it’s produced by the plant when it needs to grow quickly. Essentially, it increases the flexibility of the plant stem. You’ll also see purpling during late flower or in cold temperatures. This is due to the oils on the plant — similar to putting olive oil in the refrigerator, where it thickens or gels up. The same thing happens to a plant covered in resins or “grease.”

To prevent this plant produces the purple color because it’s more flexible and less likely to crack during shrinkage and expansion. So, a purple stem could just be a sign of rapid growth or environmental stress, like cold.

I’ve taken a green stem before and bent it back and forth a few times — it turned completely purple, just from the stress. So that’s what I think is going on here.

Some people say it’s a magnesium or phosphorus deficiency, but in my opinion, those would show up on the leaves first then the stem, both showing at the same time

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