Help! Whats with this plant?

[JayGeeCanuck]

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Grower's ForumCannabis & Growing:...What is up with thi...

What is up with this plant?
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The plant pictured was flushed 5 days ago due to nutrient burn on the tips and a persistently low runoff EC throughout the whole grow. I was actually flushing the other plant because of high runoff EC and bad burn symptoms, but figured Id also flush this one and get ahead of issues. Inflow EC before flush was around 1275. I lowered it to around 1175 or so by omitting the bloom booster i was adding (BigBud coco at about 2/3rd strength).
Is this a deficiency from the lower EC? Should I restart the BigBud and bring EC closer to 1300?
Base nutes are advanced nutrients coco connoisseur ( though I just switched over, I was using up last years sensi coco, maybe the nutes went bad?)
Frustrating considering I've been pretty diligent watching runoff and using RO. I know I goofed on the overfeeding the other one, but the one in the pic has been holding up much better until now.

 

[Jeff in Canada]

Looks like Calcium deficiency to me. How's the PH in the soil? If it has dipped much below 6 it is too low for Calcium uptake.

 

[JayGeeCanuck]

High 5s, its in coco. Maybe have to start mixing some city water in with the water? Itd raise ph a bit, and provide a bit?

 

[oldnewbdude]

I got one late into flowering doing the same thing. I havent been able to stop it. Mine is concentrated where the light is most intense, I think she's pulling too much juice through those upper leaves and it's locking out the calcium. If you can raise your lights it might be worth a try to see if it slows it down. Looks like yours is upper most parts too.

 

[JayGeeCanuck]

I got one late into flowering doing the same thing. I havent been able to stop it. Mine is concentrated where the light is most intense, I think she's pulling too much juice through those upper leaves and it's locking out the calcium. If you can raise your lights it might be worth a try to see if it slows it down. Looks like yours is upper most parts too.

Interesting. The strongest light areas do seem the worst. I thought it was that at first too, but its at recommended height so I assumed it couldn't be that. Hmmm.

 

[JayGeeCanuck]

Here's a side shot of her just now. I notice in the pics that she seems to have lighter green areas as well (which is harder to see under the grow lights ).

 

[oldnewbdude]

That might not be the whole deal but worth investigating maybe. Pretty canopy if buds you've got there.

 

[Jeff in Canada]

High 5s, its in coco. Maybe have to start mixing some city water in with the water? Itd raise ph a bit, and provide a bit?

Yes, you could try that. Try and raise the Coco PH to above 6. And, if you are not adding any form of cal/mag supplement when using Coco...that is very likely the problem. You need to add Cal/mag when using coco. I had the same problem for years. Couldn't figure it out. Why are my upper bud leaves always looking burnt when we get well into the flowering stage. I solved it finally by maintaining soil less mix above 6 and adding a low (half of recommended) but steady dose of Cal/Mg during flowering. Good luck!

 

[JayGeeCanuck]

Yes, you could try that. Try and raise the Coco PH to above 6. And, if you are not adding any form of cal/mag supplement when using Coco...that is very likely the problem. You need to add Cal/mag when using coco. I had the same problem for years. Couldn't figure it out. Why are my upper bud leaves always looking burnt when we get well into the flowering stage. I solved it finally by maintaining soil less mix above 6 and adding a low (half of recommended) but steady dose of Cal/Mg during flowering. Good luck!

Appreciate the reply! How much does this affect EC? Would I reduce base nutes to make room for it or will they tolerate the higher EC because they have what they need?

 

[Jeff in Canada]

Appreciate the reply! How much does this affect EC? Would I reduce base nutes to make room for it or will they tolerate the higher EC because they have what they need?

Your plants look really good but for this issue so you're doing things right. You have been adding plenty of nutes. For a few days I would not add any nutes and only water with PH'd water on the high side (say about 7). See if you raise the PH in the coco to about 6.5. I would also only use about half dose nutes once you get the PH corrected for the remainder of the grow. You're almost done. It may be hard to see any improvement in the plants because you're so close to the end. Adding Cal/Mag raises the PPM (EC), of course. Test your tap water, add some cal/mag, test it to get a feel for it how it effects EC. Again, I would use half recommended (or may 2/3) dose strength of cal/mag. My tap water is about 155 ppm. I add half dose of cal/mag and the water is at about 350 ppm. This is when I only add Cal/mag. Good luck! Note: I am using EC and PPM as the same thing, tomato- tamoto.