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AZ, thank you so much for your input! I will try the ammonia mixture and see if we can't get everything back on track. I agree that it doesn't look like Mg deficiency, none of the green veins on the yellow leaves, but its something to keep in mind if the N doesn't take care of things. Thank...

Hi all, Working on my second ever crop of medical MJ plants in beautiful Portland, Oregon. It's currently halfway through week 5 of flowering and MANY of my leaves are turning yellow, like bright yellow! Two look pretty healthy (in diseased, eg no other discoloration, wilting, spotting, etc.)...