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I’ve had fourteen grows, some bad, mostly good though. But this one has me stumped. It’s two sativa-dominant hybrid grown from healthy clones (details below). I tried every approach imaginable and after nothing improved them, I re-examined my soil stash and concluded that it’s lost structure...

For years I’ve used food grade citric acid to lower pH as my water source approaches 9.0. After some reading and testing I see that this is unstable - within hours of dropping it to 6.5 or so it goes right back to 9.0. I can inagine that such a short stability window causes problems even if...