One household remedy is a tablespoon of cider vinegar/gal. of water
SmokeyD.Bear Reviewed by SmokeyD.Bear 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