From what I've read, between 6.0 and 7.0. I added a supplement last fall to bring it down a bit but I haven't tested since. I'm assuming (but don't know for sure) it will have come down to the target range, but I worry that fertilizing will push it back up again.

<t>Hi,<br/>
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I planted 3 gardenias last Fall, and everything I've read about them says they require heavy feeding April - November with an acidic fertilizer like you would use for azaleas or rhodies. However, I did a pH test and my soil is already acidic - overly so actually, around 8.0 - so I ...