GNick55 said:

looks like the effects from being overwatered or nitrogen toxicity..
i haven’t read much of the thread.
how do you know when it’s time to water?

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mysticepipedon said:

It's a mobile nutrient problem. It might be Mg but it also might be P. The problem there is if it's P, adding Cal/Mag will make the problem worse. You're in fabric pots, so over watering might not be the issue. How about pH?

ASSUMING YOUR pH IS OK AND YOU'RE NOT OVER WATERING (a big assumption, either of those could be the problem): I would start with a nutrient high in P — most flower nutes should fit the bill. If that doesn't work, Cal/Mag.

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Backyard_Boogie said:

Just want to point out that in the past I have seen my share of curling leaves with off coloration just like this. It has been my experience that those ugly looking leaves usually are towards the bottom of the plant and generally it is the really large older water leaves that show most damage. Usually if you don't try to overcompensate and just take it easy on your watering and feeding regiments the ugly stuff corrects itself. For instance watch the color of the new growth at the top if it looks good just let it go and down the road you just strip off the ugly stuff at the bottom. I have seen plants that were ugly at a few points in the grow but towards the end they look beautiful. I think it's because when the plants are juveniles they are more susceptible to deficiencies and potential human error. Once they get big enough and go into beast grow mode they can handle the overwatering or over-fertilizing mistakes a bit easier. They simply get more resilient as they mature. So long as you don't go overboard to correct this you should be OK.

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