Hey grower. Was ist das Problem? Hatte ich noch nie

Most cuts you grab with some clout behind them are gonna have exacerbated autumn effects, amongst other visual appeals. Sadly, the dankest terp profile isn't what gets impressions on social media for these businesses these days. Can this be from a stressor? Sure. It is usually just modern lights/modern genetics though. As long as you're dialed in, I would never fret over purple/red stems.

Keep calm... 😌 If your plant looks healthy otherwise, then there's no reason to worry. I've had dozens of plants where those striped stems just came from the genetics. They usually tend to purple in late flowering as well. Often, the stems of the leaves (especially those that get the most light) turn purple too. When the purple runs into the leaf like that, it's 100% genetics. If not, and there's a hard distinction at the end of the stem and the plant otherwise looks rather weak, then it's phosphorus deficiency. Terp 💪👽

do note -- purple in stems is different symptom than purple in petioles (leaf stem). That often happens under LED and really no avoiding it.

Could be genetics. Could be low sulfur. If the trunk at bottom is also 'corky" even more reason to suspect low sulfur. leaf symptom charts will verify the relationship to the symptom seen.

Yeah, it can. Check your pH; it needs to be a little higher during flowering, and also make sure your soil has enough time to dry out before you water. That's usually the reason for nutrient deficiency. P.S.: Any deficiency/error you make in the soil typically shows up 1-2 weeks later. The same goes for solutions you apply. Good luck!