The Q&A Archives: pH

Question: I am growing 2 gardenia plants in containers. Which is best for maintaining pH. Aluminium sulphate or sulphur?
Thank you

Answer: Either product will lower soil pH; sulfur remains in the soil longer than aluminum sulfate, but aluminum sulafate works faster. You may not have to amend the soil at all for acid-loving plants if you use a peat moss based potting soil and regularly feed your gardenias with an acidified fertilizer (such as Miracle-Gro).

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