Duuuuude, I just ran og kush from hso as my 2nd(ish) run. Technically I'm calling my big run now my second run, but my og was kind of by itself in between the two. However I did veg it bigger than shit (feel like I've posted these pics a million times but whatever)
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I had (almost) some serious problems in early-mid flower, that didn't get all the way better for weeks. Riknstein told me he ran some og 18s and that he had to pound with nutes, that it drank them up.
My plant was hard to diagnose, bc it was so full that leaves on the bottom were yellowing and falling off, but from lack of light and part of its natural process as it ages ya know, losing the lower ones. But the top leaves (not necessarily tip top, but they could basically be found all over the plant at its worst) were green on parts with yellow, very similar to yours. Not like only yellowing in specific parts of the leaf. I also had some taco-ing going on with the leaves, and I think it was getting too much light that gave an overall yellew to the top.
But when I saw the yellowing in other parts, I thought it was maybe nute burn or pH or something so I started flushing, and it slowly got worse.
Also, notice I had mine in a 20 gallon tote at the end? It was in a #5 smart pot from one company when it first started getting deficient, and I transplanted to a #7 from a different company, and I guess I didn't put enough soil in the bottom bc it was basically the same size.
But yeah, I hated to do it but I had to transplant in flower. Remarkably I still wound up with about 10 ounces- 8 ounces of nugs (no big huge ones, either) and 2 ounces of scraggle bud for wax. Those ogs branch like crazy man, I fimmes mine and topped each top one more time, it should've had like 12-14 tops but it's branches grew so tall that the plant like didn't know what was top and what wasn't. I didn't even realize all the scraggle bud that was forming down in the middle, it all looked solid from the outside (as seen in the pic).
But anyways, yeah I recommend kicking your feeding up a notch, see if that's what it is. I almost had mine back to health just with the heavy feedings while it was still in the smart pot, but that thing begged like 2 1/2 months and it just way outgrew it. It had deficiencies, small leaves/buds, extreme lateral branching- some of the lowest branches literally just stuck straight out like 18 inches, with little buds all along it pointed up trying to get light. If you dig through my old posts I had tons of pictures from about a month ago, and a little longer. I'd post some more but they are on my old phone and I don't have a charger for it.
