@GrowerGoneWild
I'll record what I find tomorrow and post it. Thanks for all your help in the mean time!
Heh, I want to figgure out this problem, I'm supposed to be very familiar with cultivar.
So back to basics..
-Most plant problems are usually from soil problems. As high as 80%, or so my botany instructors tell me.
-Cold soil temps can look like PK problems in cannabis. I had a problem where I was doing a shed grow, and the floor was not insulated, I had to build a subfloor and put blueboard down and I put the smart pots on pallets. What really tipped me off was my water temp of plants I had in reirc drip. they looked bad like they needed PK, but the water temp was ~50's. I threw in a tank heater to keep it in the low 70's. No more PK problems. Troubleshooting for that was easy because I know that the solution wasn't lacking in anything.
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Cannabis spp. is a warm weather plant its a subtropical to tropical, plant. We know that some of the cultivars involved to make GSC are of tropical origin. I would adjust temps higher to see if its happier there.
-I did a little statistical averaging of grow temps of peoples grow I came up with 78.3 F, for ambient air temps. This is within the range of warm weather plants, for non enriched environments. See if you can get your soil temp into this range.
-One things you did mention that did stand out is the use of floro's, they work but they dont have the punch of IR or heat of a HPS light or the penetration for that matter.
-Lastly my GSC cut likes more PK. I have this rather generic mix that my mom sits in. It seems like lately the 900PPM/5.7PH mix she sits in looks like shes' underfed. A little bit of maxicrop seemed to fix her. Every other cut seems fine zero issues. It might have been that giant bucket of Maxigrow that was getting crusty for the last couple of years. It literally was smelling funny, Anyways I threw it out, and got fresh fertilizer. And as lazy as this sounds, when the PPM starts to rise, she literally explodes from the growth, its almost annoying.