Purpling??

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Hempire828

Well-Known Member
Ok fellas I gotta quick question.. What causes purpling if the stems if it’s not genetics??

I saw this all the time with my blurples and now just a touch with my 315.

Is it the blurples eating the phosphorus or making the plant use more..

Is it a ph problem, maybe not enough to allow absorption of proper nkp..

Or am I lowering my light and causes stress that I haven’t paid attention to..

Trying to stay hermie free..

Thx RIU..
 
Renfro

Renfro

Well-Known Member
It can sometimes be low phosphorous and sometimes low magnesium, often just genetic. I am not sure how lighting plays a role.
 
H

Hempire828

Well-Known Member
Thanks fellas, I did notice it more during any temp drop.. thanks again ....early morning.. cold spell dip in .. I’m in the garage for now.. warming up so about to move .. preciate man
 
Rob Roy

Rob Roy

Well-Known Member
Purpling stems could be a ph / phosphorus thing. Sometimes fluctuating well water is the culprit.

Temperatures too, but often that includes leaf purpling.

It's possible it's an anthocyanin response to some environmental factors. Cold, light spectrum (I think) can cause purpling. I put a little male plant outside the other day and he's freezing his ass off, his pollen sacks are turning purple. if the same plant had gone out during warmer weather he'd still be green.
 
Kingrow1

Kingrow1

Well-Known Member
Well years later after asking abd then persuing the same question i can say that purpleing is related to a variety of compounds based around anthrocyanin which is an osmoregulator in times of stress.

If we split anthrocyanin into its constituent compounds we would have a simple sugar joined in a reversable bond to a chemicle called cyanidin.

Cyanidin is effectively colourless and in most higher plants. As levels of water content drop sugar is concentrated and thus binds more freely with the always present cyanidin. This produces a ph dependant coloured compoud from blue to red to purple dependant on said ph - flowers of many species make great use of this and some going even futher to produce different colour flowers in different soil ph's.Being transient in nature once moisture levels increase the reaction reverses back to its constituent components and purpling dissapears.

Essentially the plant has a way of immobilizing sugars at times of stress and that lowers its need to grow at such a rate thus being more able to deal with stress and not all out growth.

Anything that causes water stress to plant matter invokes anthrocyanin, light, salt, heat, cold etc etc etc.

Whereas we try to avoid it wine grape farmers seek to increase it and the sweetness and hence their water liniting at fruit formation and harvest.

Healthy pla.ts are green as that is biologically the most efficient color :-)
 
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Hempire828

Well-Known Member
I think what I need to do is keep better notes of what’s actually going on instead of going at it day for day.. be MORE observant
Tighten my game up so to speak.. be more darn professional..
 
Kingrow1

Kingrow1

Well-Known Member
Hempire828 said:
I think what I need to do is keep better notes of what’s actually going on instead of going at it day for day.. be MORE observant
Tighten my game up so to speak.. be more darn professional..
Click to expand...
In response to led users and their never ending portrayal of their lights being far superior (ppfd broscientists) to hps (and ocassionally cmh if they dare) i wrote that they sorely lack firstly the spectrum and secondly the high level of infared in all its width and strength than that of the hps and cmh and even the sun of which around half of it is infared.

We could thus sumarise that more purpling will be had from leds as hps and cmh drive transpiration more efficiently as one would find in nature when that extra level of infa red and other spectrums are had.

Thats my best guess but hopefully a good one. Try to ignore single nutrients and ph for the bigger picture as one could spend a life time analyzing phosphorus of five mins just buying the appropriate complete fertilizer :-)
 
Capn-Crunch

Capn-Crunch

Well-Known Member
Greengenes had a discussion a couple weeks ago on IR and LED's and he recomended the higher temps to compensate for it.
 
H

Hempire828

Well-Known Member
Ok the temp.. if this plant requires full sun and grows from spring to fall, going through hot ass summers in certain areas.. why do we have to keep the heat down so much.. I always thought Cannabis loves the heat...I’m always trying to keep temperatures around 21-27c wouldn’t sativa type plants want more heat?? And Indy less heat..
 
A

Aqua Man

Well-Known Member
Kingrow1 said:
In response to led users and their never ending portrayal of their lights being far superior (ppfd broscientists) to hps (and ocassionally cmh if they dare) i wrote that they sorely lack firstly the spectrum and secondly the high level of infared in all its width and strength than that of the hps and cmh and even the sun of which around half of it is infared.

We could thus sumarise that more purpling will be had from leds as hps and cmh drive transpiration more efficiently as one would find in nature when that extra level of infa red and other spectrums are had.

Thats my best guess but hopefully a good one. Try to ignore single nutrients and ph for the bigger picture as one could spend a life time analyzing phosphorus of five mins just buying the appropriate complete fertilizer :-)
Click to expand...
I was going to say its possibly the leaf temp with LED lacking IR spectrums. I had this happen to me and was resolved increasing my air temps. I use VPD and take leaf temp into account so i noticed that exact phenomenon with my HLG 600 that provides virtually no IR its not uncommon that my leaf temps are 8F cooler than my air temp depending on my fans. I don't believe this would be as much of an issue under other lights providing more IR or with LED supplementing IR. I shoot for leaf temps at 75F lights on and 70 lights out during veg now. Adjusting the fans also made a difference. I see you talked about this in your next post but figured I would add my experience with the issue
 
Kingrow1

Kingrow1

Well-Known Member
Hempire828 said:
Ok the temp.. if this plant requires full sun and grows from spring to fall, going through hot ass summers in certain areas.. why do we have to keep the heat down so much.. I always thought Cannabis loves the heat...I’m always trying to keep temperatures around 21-27c wouldn’t sativa type plants want more heat?? And Indy less heat..
Click to expand...
We dont but many place a thermometer in the light which gives false readings :-)
 
Kingrow1

Kingrow1

Well-Known Member
Capn-Crunch said:
Greengenes had a discussion a couple weeks ago on IR and LED's and he recomended the higher temps to compensate for it.
Click to expand...
Ive seen a lot of debate on wether this is a valid method, it works to a point but imo does not supplement the lost spectrum imo.

Prior to my coment on ourpling above im not saying leds cause it but there could be reason its seen more maybe :-)
 
Kingrow1

Kingrow1

Well-Known Member
Aqua Man said:
I was going to say its possibly the leaf temp with LED lacking IR spectrums. I had this happen to me and was resolved increasing my air temps. I use VPD and take leaf temp into account so i noticed that exact phenomenon with my HLG 600 that provides virtually no IR its not uncommon that my leaf temps are 8F cooler than my air temp depending on my fans. I don't believe this would be as much of an issue under other lights providing more IR or with LED supplementing IR. I shoot for leaf temps at 75F lights on and 70 lights out during veg now. Adjusting the fans also made a difference. I see you talked about this in your next post but figured I would add my experience with the issue
Click to expand...
Sometimes my t5 flouro veg plants are a little off but shoot up when transfered to hps. I guess its not just leds. None of our lights really cone that close to the sun :-)
 
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