I know I'm nuts but here goes. I grow citrus trees and anything else that looks cool and doesn't belong here in Boston. I have learned that citrus especially lemons are quite particular about their pH levels SO....I bought a sophisticated pH meter and I have been enjoying learning about pH. Well my question is how fussy are hibiscus, or other plants like jasmin and oleander, about their pH? I just repotted ALL my plants and brought them outdoors for the summer so I figured hey why not test this potting soil that I am using for the first time, Miracle-Gro with slow release fertilizer in it. Well it seems to have a rather alarmingly (to me) low pH (around 4.8 to 5.0) Is this too acidic for these plants? AM I being paranoid? The citrus trees are potted in coconut husk chips which is a perfect 7.0 Thanks for your help.