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What's going on with my clones? Do not have much information to add. VPD is not terribly off, DLI around 25.
ezgrows4anoobstarted grow question 2 years ago
What's going on with these clones? Not sure what it could be. They could possibly be rootbound. They should have been transplanted a few weeks ago but I did not have the space.
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GrowingTrannyanswered grow question 2 years ago
This problem is caused by wrong pH from the medium and a nutrient lockout because of that. The issue with cannabis plants is that they are only able to take up nutrients within a small pH window, which ranges from about 6–7 when growing in soil. If the pH is lower or higher than that, the plant cannot take in nutrients, even if they are present—thus spurring nutrient deficiencies via "nutrient lockout".
You need to flush the soil. Just follow these steps.
https://www.royalqueenseeds.com/blog-how-and-when-to-flush-marijuana-plants-n312
Organomananswered grow question 2 years ago
Burning from nutrient salt build up in those tiny cups.
Transplant into fresh medium asap.
Calcium deficiencies are identified as yellowy brown rounded spots, not burnt blotches.
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m0useanswered grow question 2 years ago
This looks like some PH shock to me OR could also be some boron deficiency.
Its not to easy to get a micro deficiency.
Calcium tends to be rounded spots and not following a pattern or cell structure alignment on the leaves but this one is.
I would look into what you are feeding them and the PH of the medium.
Best Of Luck!
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