Went to my local gardening store and they didn't have any Ph Down that I've heard of i.e. Nitric or Phosphoric Acid, only Gypsum. If my plants are in about 7.0-7.2 Ph can I use Gypsum?
Nope didn't help at all... lol JK. Well I know not to use Gypsum for lowering Ph, but I need to know where to get a chem that I can use then! Any places to buy from?
