Too much water and too much neem oil.
Go back to hand-watering, and lay off the neem. You are suffocating your plants with it, and should be using a MUCH lighter application and frequency.
stinkyattic Reviewed by stinkyattic on . Blackened leaves, wilting and drying up - need help - 1st grow I need advise. 1st grow and been in veg for the past 8 weeks. Trying out the "sea of green method" (clipping tips to branch out like rain deer antlers) I have had already trouble with nute lock up which I flushed and seemed to recover except two of the plant strands "purps". The two "purps: don't absorb as much water as the rest. THen they got hit with heat stress from 2 week heatwave where temp got as high as 99 to 120 (cool down method - water mister on timer 3 times per day for 2 minute Rating: 5