Purple Streaked Leaves

Okay so basically yesterday I noticed some grey streakage on middle to upper leaves which I assumed was Phosphorous deficiency due to not watering in about a day and a half. I am growing in Rockwool cubes and having done research have found that under watering can cause a spike in pH. I assumed that due to this it had caused a deficiency in the plant. Anyway, this morning I noticed that these grey streaks have now turned purple and I am unaware of what this means. Firstly I am always in pH of 5.8-6.4. GH nutes. adapted Lucas' formula (not really L's formula anymore but) 3 ml grow 8 ml Micro and 14ml bloom for every 3.4l. EC is always at 2.0 meaning ppm's are roughly 1000-1100. My water before hand has an EC of 0.05. I water typically twice a day but recently decided to let plants dry out a bit more. This plant in particular was bone bone dry, and I have now fed it after noticing what i assumed as a P def, but have now noticed progression into purple streaks. 400w light above this plant and the plant is approx 3 feet. Temp is 80f in day and as low as 50 at night. The purple stems are also signs of P def right? But could this also be caused by cold temps at night? Anyway.. enough jabber, pics. 3rd week into flowering.

I could be wrong, but, you may be at the early stages of a spotted mite issue....
I see tinny brown spots on some leaves. check the under sides of your leaves for mites / eggs.

If you find mites, PLEASE don't poison yourself trying to kill them with pesticides. Use 1 tablespoon of dish detergent and one table spoon of cayane pepper in a gallon of water let the mixture sit over night , strain through coffee filter and spray on your plants. make sure to get underneath leaves, stems, ect. Your buds are young enough that water mixture wont hurt them.
Just ensure good air flow around your plants.

The purple areas on your leaves look like a P deficiency. Leaf edges are curling upwards as well.

jafro daweedhound said:

I could be wrong, but, you may be at the early stages of a spotted mite issue....
I see tinny brown spots on some leaves. check the under sides of your leaves for mites / eggs.

If you find mites, PLEASE don't poison yourself trying to kill them with pesticides. Use 1 tablespoon of dish detergent and one table spoon of cayane pepper in a gallon of water let the mixture sit over night , strain through coffee filter and spray on your plants. make sure to get underneath leaves, stems, ect. Your buds are young enough that water mixture wont hurt them.
Just ensure good air flow around your plants.

The purple areas on your leaves look like a P deficiency. Leaf edges are curling upwards as well.

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I've just had a good look and cant seem to find anything, but will regularly check... thank you for reply.. Another one of my plants has now developed the same issues and im panicking now :/

Rockwool said:

I've just had a good look and cant seem to find anything, but will regularly check... thank you for reply.. Another one of my plants has now developed the same issues and im panicking now :/

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So, if these were my plants I would gear up to treat a Calcium and Magnesium issue first off. Phosphorus deficiencies manifest themselves as purple/red stems with purple or red running all the way down the main vein of the leaf and there will most likely be some yellowing; you don't have this. Don't worry it will only get worse!!!! Totally kidding.. It will be OK, just fix it now. Good luck

Jimmy Sparkle said:

So, if these were my plants I would gear up to treat a Calcium and Magnesium issue first off. Phosphorus deficiencies manifest themselves as purple/red stems with purple or red running all the way down the main vein of the leaf and there will most likely be some yellowing; you don't have this. Don't worry it will only get worse!!!! Totally kidding.. It will be OK, just fix it now. Good luck

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You're such a cruel fucker hahaha thank you man will get to adding Cal/Mag now!!

Rockwool said:

You're such a cruel fucker hahaha thank you man will get to adding Cal/Mag now!!

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Lol!!!! Mj is a strong plant. You WILL be golden.

Also, don't

Rockwool said:

You're such a cruel fucker hahaha thank you man will get to adding Cal/Mag now!!

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Also, don't get frustrated because you aren't noticing a massive improvement by tomorrow. I'm exaggerating but it does take a while to see improvement and you most likely will not notice much if any improvement in the leafs already damaged . .. I like botanicare cal mag with iron for my non "organic" grows.

are these areas of purple spots turning up on new growth or old growth first (new leaves or old leaves ). Old growth fan leaves would indicate a mobile element, newer growth would indicate a immobile element deficiency.
Are the areas of discoloration localized ( top or bottom of plant ).

Also you mentioned that you are now watering less often (feeding less often). you may want to go back to feeding twice a day or more. just be sure you have good run off back to reservoir (or to waist). I assume you have a nutrient reservoir, or are you hand watering and mixing your plants food each day ? Ensure that your reservoir is of sufficient size to avoid depletion of pacific elements between nutrient changes. I would empty my reservoir weekly and replenish with fresh nutrients - that are PH adjusted to 5.5 to 6.0 for RW.

Phosphorus deficiency symptoms
Plants are stunted and often a dark(er) green color. Anthocyanin pigments may accumulate (purple spots). Deficiency symptoms occur first in more mature leaves. Further more plant maturity maybe delayed.

jafro daweedhound said:

are these areas of purple spots turning up on new growth or old growth first (new leaves or old leaves ). Old growth fan leaves would indicate a mobile element, newer growth would indicate a immobile element deficiency.
Are the areas of discoloration localized ( top or bottom of plant ).

Also you mentioned that you are now watering less often (feeding less often). you may want to go back to feeding twice a day or more. just be sure you have good run off back to reservoir (or to waist). I assume you have a nutrient reservoir, or are you hand watering and mixing your plants food each day ? Ensure that your reservoir is of sufficient size to avoid depletion of pacific elements between nutrient changes. I would empty my reservoir weekly and replenish with fresh nutrients - that are PH adjusted to 5.5 to 6.0 for RW.

Phosphorus deficiency symptoms
Plants are stunted and often a dark(er) green color. Anthocyanin pigments may accumulate (purple spots). Deficiency symptoms occur first in more mature leaves. Further more plant maturity maybe delayed.

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Okay it is with newer growth that this is occurring, and i am feeding by hand at the moment so it is going to waste. Discoloration is newer leaves but not the newest if that makes sense? About a node or two down from the buds. I will go back to feeding more regularly and okay so to kill two birds with one stone, if i up more of the micro and bloom which will lead to higher cal and mag and also P, this will help right? When i say up it lets say 9ml of micro now and 16ml of bloom whilst still adding 3ml grow for extra mag? Edit: i am out of calmag shit - a mix of what i spoke of with GH Nutes concludes to 1125 ppm, 125ppm more than usual will this be okay also?

Rockwool said:

Okay it is with newer growth that this is occurring, and i am feeding by hand at the moment so it is going to waste. Discoloration is newer leaves but not the newest if that makes sense? About a node or two down from the buds. I will go back to feeding more regularly and okay so to kill two birds with one stone, if i up more of the micro and bloom which will lead to higher cal and mag and also P, this will help right? When i say up it lets say 9ml of micro now and 16ml of bloom whilst still adding 3ml grow for extra mag?

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I'm not entirely familiar with those products however by doing that you may find that you are increasing the amount of other nutrients not necessary and causing other issues. Calcium in theory is entirely mobile in liquid or chelated form and it's also bio available immediately. If the liquid,dirt,Coco or whatever your choice of grow style is de -void of calcium and or magnesium and you don't add any or much....... Where does this come from? You! You've got to add it. Old growth shows you what's happened and the new is showing you what is currently happening.... It will all be OK.

Jimmy Sparkle said:

I'm not entirely familiar with those products however by doing that you may find that you are increasing the amount of other nutrients not necessary and causing other issues. Calcium in theory is entirely mobile in liquid or chelated form and it's also bio available immediately. If the liquid,dirt,Coco or whatever your choice of grow style is de -void of calcium and or magnesium and you don't add any or much....... Where does this come from? You! You've got to add it. Old growth shows you what's happened and the new is showing you what is currently happening.... It will all be OK.

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The real question is Jimmy, can you tuck me into bed? I really appreciate it thank you

Rockwool said:

The real question is Jimmy, can you tuck me into bed? I really appreciate it thank you

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My guy, with all the worrying that you've been doing... I would if I was there Lmfao!!