Very good!Originally Posted by bcotton
Yes, the shale is made at least partially (if not wholly) of limestone. Too bad they don't tell you this upfront, huh?
A pH of 7.2 - 7.8 is pretty darn good as far as I'm concerned. Pretty much anything in the 6 to 8 range is just fine. If it gets too low, raise it up, but in your case if it gets too high, lower it. The nice thing about your shale is it is acting as a nearly infinite buffer. You can't fight the ongoing chemical reaction in your system; so, just live with it.
A higher pH makes the plants ugly and lowers the nutrition of leafy greens, but fruiting vegetables may or may not be significantly affected.