Which soil pH for blue hibiscus/rose of Sharon?
I have read conflicting information on the soil pH for growing hibiscus. I have heard the blue ones need alkaline soil and the other colors need slightly acidic. I've also read that hibiscus/roses of Sharon aren't really picky at all when it comes to soil pH. I just bought a blue hardy and a white chiffon yesterday. I would be so grateful if someone could clear this up for me. Thank you kindly, Monique Loupe New Orleans, LA
Certified GKH Gardening Expert
It is much too difficult to provide and maintain exact pH of each around each area, and the results are negligible. There are chemical reasons why blues require an acidic environment, but this is a very complicated subject. The exact values will be within a few tenths of a point of each other, so it is not really feasible to try and keep this constant. In reality, as long as the pH is between 6 and 6.9 they will be just fine.