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Within the last 4-5 days all my plants have started to show yellowing leaves like this.. I thought it was from lockout, but my ph is pretty good at 6.2-6.4 (soil). Then thought calcium or zinc Def.. but nutes aren't helping... It has been quite hot this week, and I haven't been watering extra...

Is this an excessive amount of colas for an outdoor grow? I've been told this is overkill, but I don't really understand why it could negatively impact yeild. (I've also just fimmed 3-4 of the highest tops on each... so more stems on the way....) It's outdoor in a very windy environment, I'm not...