The soil in my area (Berkeley, CA) is clay, which I understand is usually acid (I'll check mine with a pH test). I have a bunch of old (1910) mortar from taking out a chimney (seismic concerns) and cleaning off the brick for reuse. I understand old mortar is usually just sand and lime, so it seems like this would make a good treatment for acidic clay soil. Would it be crazy to spread this over my yard and mix it in? I'm going to be re-landscaping most of the lot (1/8 acre) anyway.
Thanks, Wayne
P.S. I understand that most wallboard is just gypsum and paper, and that gypsum is also good for acidic clay soil. What is a good way to grind up wallboard scraps?