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between 6.2 - 6.8 works the best for me. print them charts in the thread all info givin works well.... its taken from the "marijuana insiders growing guide" by Mel Frank page 131 circa 1988 Red Eye Press.OH yea,just what i was lookin for!!well done dudes!!so i thought my soil was supposed to be 6.5??the chart says 5.6-5.8?? a bit confusing /im half peat half coco w/dolo/kelp ect.. sooooo PH isss???????????check water runoff{using drops} or soil tester???