You want between 6.3 and 6.8. Here is a link for reference. Save so you can refer back to if any questions. Hope this helps out. http://boards.cannabis.com/attachmen...0&d=1121829312



b0nger
bongerstonerd00d Reviewed by bongerstonerd00d on . Lowering the Ph Hey so I tested the potting soil today and the Ph is around 7, anyone have any suggestion to bring it back down to 5.5-6? I know for large scale farms they use elemental sulfur, but I wasn't sure if that was the proper way. And would that be causing the plant to look lighter in color and start to yellow in some places? Thanks. Rating: 5