Yes this is the Hydro section so I was just answering for Hydro.

Herbus
Herbus Reviewed by Herbus on . which pH chart is right? What is the best pH for hydro for MJ during flowering?? On the internet you can find charts showing nutrient absorption through the pH range. But theyâ??re all freaking different! And directly conflicting. See below: 1) A chart from www.overgrow.com (guess they should know about pH for MJâ?¦) 2) A more commonly seen chart, taken from an orchid-growing website (this chart is the same as one thatâ??s sold in grow shops around here) 3) From an avocado growing website 4) From the Rating: 5