I would love to see the results of a cannabis grow where the pH starts at 4 and is allowed to drift upward. In my experience, this would be bad... but I certainly keep an open mind. Every hot grow I have ever seen ended with poor results, burnt leaf tips, nutrient lock, etc.
I grow in straight coco coir, and 5.5-6.0 is where I get my best results.
I grow in straight coco coir, and 5.5-6.0 is where I get my best results.