get some pH down (for gardening, not aquariums), and water with a pH of around 5.5 - 6.

You can also get a soil test kit to see what your actual soil pH is as well as NPK.

How are you testing pH now???
Dorje113 Reviewed by Dorje113 on . soil ph too high I am using an organic soil consisting of Kellogg Patio Plus mixed with 25% perlite in 5 gallon containers. I just transplanted my plants about two weeks ago & I have noticed that I cannot get my ph lower than 7.5. my plants were doing fine until a few days ago I noticed that they were not thriving any longer. in fact they are showing signs of mg and maybe zinc defs. I added some epsom salt to help but I understand that if the ph is off then lockout is the likely culprit. Its too late to remix Rating: 5