I have wallboard scraps here and was doing some research online.
Basically, everything I found was hearsay. One problem is the
possibility of additives, especially glue. The other is that it's best
broken (or ground up). How to do that is an issue. Supposedly gypsum
is a good additive to lighten clay soils. I was thinking of buying a
bag and working in soil in my herb garden with manure.
One thing that the bagged gypsum is clear on in it's instructions is
that it must be mixed with the soil to do any good, not just thrown on
top. I assume that the same is true for wallboard as a soil amendment.
How to break it up?
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