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Originally Posted by ChefBert
OK so I think I have some anaswers. Marsha was right on the money about the pH. Got an el cheapo pH meter and it indicates a pH of 6 or lower. Definitly too acidic.
Now here is the insight. A couple of months ago I wrote about finding a new potting mix from Bonnie's at a real good price. It felt and smelt alot like ProMix at $12/3.8 cuft. IT HAD LIME ALREADY ADDED! With pine bark fines and MORE dolomite added, no wonder it's too acidic.
Is there a way to correct this without re-potting all the plants? The Rebel Alliance is no problem but other plants may not be quite so acidic, they are still out of optimum range. What can I do to bring it up to 6.8 +/-?
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Increasing the lime, which is basic, will help neutralize the acidity. I use about 1 cup of dolomite/lime for a 5 to 7 gallon pot. It takes a few months to dissolve.