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The ideal pH level for vegetables is 6.5, but their growth won’t be hindered between the 5.5 - 7.5 pH range. Adding lime into a mix can lower the pH level to 6 -6.5 to start seeds successfully.

To make your soil less acidic, add some lime to raise its pH to keep your herbs happy. And if you want to lower pH, mix elemental sulfur into your soil. There are some kinds of herbs that can grow ...