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 they’re all freaking different! And directly conflicting. See below: 1) A chart from www.overgrow.com (guess they should know about pH for MJ…) 2) A more commonly seen chart, taken from an orchid-growing website (this chart is the same as one that’s sold in grow shops around here) 3) From an avocado growing website 4) From the book Indoor Marijuana Horticulture ( I think by Jorge Cervantes) 5) From a site that does NFT, in New Zealand Following the charts from Overgrow and from the book, the biggest P absorption would happen way low – around 5.3 would be optimal. According to other charts, the P absorption doesn’t even start to happen until 6.0 minimum – 6.2 or 6.3 even better. I am confused. I’m tempted to set it at 6.3. I don’t think that anyone’s actually scientifically determined this for MJ using the methods they do for other plants. So who knows; take a wild guess I guess. Was wondering what pH other people have used that gave the most resin production and smell?