Sally--
Oyster shell grit would be the most desirable as a calcium source
in your Tomato beds. Tomatoes need a lot of Calcium to prevent
"Blosson End Rot" on the fruit.
If you--or anyone else, could find a way to grind up Oyster Shells..
it would take care of this n no time flat.
I have never heard of Granite as a usable soil amendment. ?????
That is one HARD rock!!! Don't think it has any soil nutrients in it.
