Indeed it can be natural during the flowering state. The plant is using all its store food from the leaves to produce the buds. So it starts taking the nitrogen, first from the bottom leaves to feed itself. Pictures would definately be helpful. The pH strips are a pain to use. My advice, if you dont have a digital pH tester is goto a petshop and buy a water pH tester for fish aquariums. They give you a small vial and drops to put in the water. That will give me a bit more accurate reading. If your pH is 7, it is definately on the higher end and can cause nute lock. The preferred pH range for marijuana is 6.3 to 6.8 with 6.5 being ideal.

GTD
GreenThumbDoc Reviewed by GreenThumbDoc on . trouble shooting advice??? Thanks for reading. i have leaves turning yellow rapidly and falling off. im in the 4th week of flowering and ive never had this problem before. And on all the leaves the tips are turning up and are brown n crispy. Ive flushed it thinking it was nute lock and the problem is geting worse. Any help would be great. THANKS Rating: 5