Purple stems bad?

[anitl]

I'd look at the plant as a whole if it's growing healthy and not slowing down and has purple red stems I'd not be worried but if it's slowed down leaves look off it hasn't grown for a while no taking up water and you've got red stems you've probably got an issue ..... most times I've had this problem I've brought the temps up higher and upped the calmag dosage .... it's always worked for me

Helpful tip, thanks! I’ve noticed some of my plants also develop red stems sometimes, and I’ve always wondered what caused it. I’ll try raising the temperature and adding Cal-Mag if I see those signs again. How often have you run into this issue?

 

[LewberDewber852]

I haven't figured it out yet either, but it definitely shows up more in potted plants. When I grow a plant outdoors directly in the ground, they don't get red stems, not even in late flower when temps drop below 50f. When I grow cuttings of those same green plants indoors, the red stems show up no matter what I do, especially on the plants that have purple flowers.
I suspect it has something to do with the growing medium. Almost every potting mix has peat moss, which acidifies the soil and locks out calcium and magnesium.
Ive noticed that increasing potassium helps but it doesn't completely stop the red stems.

Ive had similar observations.
Good info on the peat moss making soil more acidic. I learned something today. Goes to show why limestone is bene.

 

[Liamp1603]

Helpful tip, thanks! I’ve noticed some of my plants also develop red stems sometimes, and I’ve always wondered what caused it. I’ll try raising the temperature and adding Cal-Mag if I see those signs again. How often have you run into this issue?

I received some Mac 1 cuts this time round and I couldn't get them to grow at all until I fed them cal mag only and put the temps in the high 80s that was in veg I struggled with them and now they're tiny compared to the other plants in my room ..... but in flower they're taking the same nutes as the rest of the room and the temps are high 70s low 80s and they're thriving the trichomes production is amazing on them