re: Planting 7gallon Gardenias- August Beauties

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s clay-based and has been mulched for 23 years. My understanding is that should be pretty damn acidic. Can anyone validate that, in a general sense?

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It may lower the pH slightly but not much. I live in an area with alkaline soils and even with amendments like crawdude listed, you only would get 3 years or so before you had to reapply the amendments. People around here that grow azaleas end up rebuilding the beds every 6 or 7 years.