Hey everyone,
I'm running a 12/12 from seed experiment with numerous strains and after pulling every plant out of the tent for a rearrangement, I noticed this on one and only one out of the 35 or so plants.
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I wish I could tell you how long she has been this way but I can't...I simply don't know.
I water almost daily...probably 5 out of 7 days and feeding is with every watering.
Running Coco/Perlite mix. 50% strength of my nute schedule which is only about 900 PPM. PH'd on every watering at 5.8 to 6.0. I water with large amounts of run-off each and every time to avoid the need to flush.
Hopefully you can help and this is an easy diagnosis.