Hi I posted under general but thought this would be more appropriate My girls has been transplanted about 20 days ago. Recently they started displaying problem attached in the pic. The temperature is 74-77 with humidity around 60 I feed them about every other day and water them every third time. The conditions in the room are very stable. I have 4 medium size fans blowing from every wall in the room. The bottom foliage is nice and green but the top looks like the picture throughout my crop. At first I thought it was heat stress but then realized that it looks more like a diffitiency. I need help understanding why.
you are insisting it's not a heat issue.. how about ventilation. is there fresh air moving in and hot are being expelled? runoff ph? other option is to feed, water, water. cut back the nutes a bit
You should list all the details of your grow; in this subforum is a thread pinned to the front page "when posting sick plants problems"....fill out the form and paste it here. Canoeing of the leaves is caused by moisture stress of some sort....could be light heat overfeeding etc...need to know more about your conditions.