I had a similar problem on my last grow, i flushed with plain water, and then used a high nitrogen fertilizer for folowing watering, i thought my problem may have been excess salt build up but I never found out
amstron Reviewed by amstron on . Ok I'm desperate now! I can't figure out what is wrong with my plants. They are about 3 weeks old and the bottom leaves are turning yellow, then black and falling off. I'm using 3 different kinds of soil so I doubt that. I've tried varying the water schedule even. My one plant that was completely healthy is now turning the lower leaves black. My 600watt hps is plenty far away, I've varied that as well. These plants aren't going to do very well at this rate. Some are 1/8th the size of others and have barley Rating: 5