You can find a decent cheap digital pH pen on the bay for 20-25 dollars.... They aren't the top of the line, but they do what they're supposed to do... You should invest in one. Hell, invest in two, it's never a bad thing to have a spare around
dooobster Reviewed by dooobster 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