hey since you are growing organic, you can try to either construct your soil so it's the right pH, or you can just sorta add some stuff on top to alter the pH of soil you already have your plants in. dolomite lime raises your pH, but makes it so it never goes over 7, which is great because the proper soil pH is about 6.5. top soil is also very basic, so it makes a nice mix to ur soil if it's too acidic. to lower your pH, you can just put a couple drops of plain white vinegar into the water you water your plants with, or you can mix some more peat moss into your soil. hope that helps a bit.