Thanks all, but it still doesn't make sense that a processed oyster shell would STILL have salt on it after the processing: surely they are washed before being shucked. Or does the shell absorb salt during the growth process?
I've bought (for another job) the smallest pea stone HD and Lowe's sells, and it's wa-aaay to big for many of my semps.
I've tried our local crushing operations and they just looked at me as if I were speaking Martian.
Twit, "soil collapse" WTH is that? I've got a lasagna of road gravel (semps are planted in this), bark mulch (I actually thought about firing the person who did this) and just enough oyster shell to prevent the lower leaves of the semps from touching the bark.
After the problems I had last year with the road gravel growing moss all over the place, I decided against using more of it.
