I picked all yellow leaves off yesterday and this (pics) is what I have today. I added some nitrogen yesterday and checked PH which = 6.5
Any help/suggestions will be appreciated.
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How hot is it where you are growing? I ask because I had the same thing. 11 plants and the 2 that were in cloth pots were losing leaves (yellowing) and the consensus was a combo of hunger and improper watering. The cloth pots were drying out faster than the ones in thicker containers or in the ground. I had to switch to watering 2x a day but less time.
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… and up their food.
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I’m in Virginia Beach, VA. It does get hot (upper 90s) occasionally but not for the last week or so. This plant is in a Grow Box
so I dont think the issue is watering.
More help will be appreciated.
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PH 6.4. Have added lots of nitrogen. Little to no improvement. Any other sugestions?
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I was experiencing the same thing with my outdoors. Now, some fan leaves/older leaves yellowing when entering flower is common but I found mine to be a little more wide spread than what I felt was normal.
I WAS on a water/feed/water/feed schedule so I just doubled my feeding and just use nutes every time I water now and I no longer have an issue. I think leaf yellowing can also be from the plant robbing P and K from the leaves when she is flowering and isn’t getting enough of it, so like you said, your nitrogen may be fine but a shortage of potassium and phosphorous could also be the culprit at this point.
Please correct me anyone, if I am wrong on this.
I keep an open mind.
Shock
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This for sure. 
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