I have an issue that I’m hoping someone has experience with. Both of my grows have done this. I start the plants off with anything(cfl/induction) but led light, then I ease them into the led. Issue is, soon after the addition of the leds I start seeing purpling of the stems, just the top that’s exposed to the led. They get plenty of calmag, aren’t deficient in anything and the ph of soil and water is good. Idk if this purpling is good, bad or doesn’t matter. Doesn’t seem to be strain specific.
Unless the light, being more intense, makes the plant use up more nutes. I’m thinking that now as I actually have a purple vein on the first fan leaf of my diesel dipped cookies. My sour diesel isn’t as purple. I’ve also been feeding them the same nutes, so it is possible the DDC wants more.
It’s not the LEDs, I’ve never heard of LEDs doing that before. I know purple/red stems is usually genetic or a deficiency/toxicity in the plant.
You should fill out a “Support Ticket” and post it into your thread.
Strain; Type, Bag seed, or Unknown
Soil in pots, Hydroponic, or Coco?
PH of runoff or solution in reservoir?
What is strength of nutrient mix? EC, or TDS
Indoor or Outdoor?
Light system, size?
Temps; Day, Night?
Humidity; Day, Night?
Ventilation system; Yes, No, Size?
AC, Humidifier, De-humidifier?
Co2; Yes, No?
Add anything else you feel would help us give you a most informed answer. Feel free to elaborate, but short, to the point questions and facts will help us help you smile!
I see that on a few leaves but not throughout the plant. I know that I don’t have any nutrient deficiency and the ph is smack in the middle of the perfect range. Og Kush and White Widow. I am also under led’s but agree that you could rule that out.
Yea I don’t know lol, maybe it’s just one of those random things? Maybe it is the LED? I’d love know though!
I only see it on older fan leaves and IIRC usually on a main stem; not a secondary branch. But the rest of the plant could be used to advertise Fox Farms fertilizer lol.
Cal mag deficiency can show up as this, although when I grew WW there was purpling of petioles that may have been genetics
I also have purple stems/branches on my WW … probably just genetics
My white widows have purple stems on some of them so I think it is a genetic trait by. I didn’t have any issues with them stemming from the purple stems (no pun intended)
Strain; Type, Bag seed, or Unknown
Sour diesel, diesel dipped cookies
Soil in pots, Hydroponic, or Coco?
3 gal smart pots
Soil- Promix bx with:
EWC
azomite
great white myco
compost
8-2-1 
0-10-0
PH of runoff or solution in reservoir?
6.8
What is strength of nutrient mix? EC, or TDS
Started fertilizing end of 3rd week from sprout 1/8 recommend strength of:
Sensi CalMg+
Kelp (me kelp you)
- started adding Earth juice catalyst and Fish emulsion week 6, in an aerated compost team , ph 6.5
By week 8 everything is full strength, week 9 adjusted ph of tea to 7 as runoff was 6. Now ph is 6.5-6.8
Indoor or Outdoor?
In
Light system, size?
500w induction until week 9(may 11) added 2-300w viparspectra
Temps; Day, Night?
78-82, 70-74
Humidity; Day, Night?
40-50
Ventilation system; Yes, No, Size?
Yes, not on yet. Windows open in room to circulate fresh air
400cfm fan/filter
AC, Humidifier, De-humidifier?
No need
Co2; Yes, No?
No
I think that’s most of the info.
I might have worded the first post weird- I meant I was wondering as the led is more intense light, if the plants might be using up the nutrients faster. There was no purpling until I added the leds, two days later slight purpling.
I’m not sure, maybe the genetics have some purple…?
I upped the 0-10-0 a tiny bit today on the DDC with the purple leaf vein. Maybe it will help. Also added 2ml more of calmg.
I didn’t give the sour diesel anything extra. Just full strength everything…actually not everything. Its a lot to type lol.
I added this picture to show that the purple is only where the led light hits the plants. Under the induction side I don’t see any petiole purple.
(The ind light is actually a little more to the left…)
Increase the cal mag and phosphorus slightly . Usually red or purple stems are genetics, cal mag deficiency, phosphorus deficiency or overall combined cal mag and phosphorus deficiency
Found it funny that after I started this thread I was browsing YouTube and this guy said said the same thing I asked about… so is it an led thing or calmg lol? I had upped the calmag 2ml anyway. And it’s actually the petioles not stem, I forgot to correct that. I really can’t believe it’s a deficiency as they’re getting about 8-10ml of calmg+ about every 4 days. Started at 3ml at 3 weeks(I think, maybe 4 weeks, there was also azomite in the soil), and worked my way up a couple ml/wk. I don’t think they have a lockout either. I guess I’m just rambling…
Anyway, anyone think should I wait too see if the slight purpling clears up before flowering? It’s coming up on week 10 of veg…
@ 2:08
Here they are today…I’d really like to fill up some more squares before I switch to 12/1. Which brings me to another question; If you’re just going to basically flatten the plant out with a scrog, why would stretching be bad in the beginning? I know everyone is pretty concerned about stretching when the plants are young. From my point of view, it seems that the stretching would be good as you can get a wider plant canopy after putting in the net. No? I don’t much about it so I’m a little confused. Actually, the whole stretching subject is something I haven’t researched yet… Is it that you don’t want the stretch because it makes the internodal spacing too large? Is it just a space limitation thing-you don’t want a long gangly plant that has no room to bid? Is it easier for the bud sort of to grow together(fill the space between the nodes) or tighter when the nodes are closer? Is it just preference? I’d prefer to have a large flat plant with a 12" canopy that gets plenty of even light. So it seems like longer branches with greater node spacing would be perfect!?
Please fill me in guys lol!
I have wondered too. So I will lurk in the background if you don’t mind.
I’ve seen similar purpling on my Og Kush under led’s although mostly fan leaves and only a few. There is certainly no nutrient deficiency. I think you are fine but like all of us it’s good to be on top of it.
First, I hope everyones grows are going great!
Secondly, should I not transplant if I’ve changed to 12/12? Today will be first day of 12hr light… but I’m thinking bigger pots is going to help my yield. I’m positive it will actually, but I don’t want to shock them. Not that I’ve ever had shock issues before, just sayin.
I guess I could keep them on 18/6 for another week. They only had 12 hours of darkness last night, so I could probably keep that 18L and go back to 6Dark and not mess them up right?
What do you guys think?
I say transplant. It worked for me but all plants are different
Well, no issues with the transplant. No droop or shock whatsoever, if anything I’d say they looked a bit more perky this morning-about 14 hours later.
Hope everyone is having a fun and safe holiday weekend!
I thought I’d share my excitement with a photo! I know they were most likely females but they are definitely showing now…5 days from 12/12 switch.
I also started 2 kimbo kush(top 2)and 3 sour diesel last Sunday so they’ll have time to veg while the others are in flower and drying in the tent. I think the timing should work out well.