| I also use oyster shell or lime pellets in some of my paph pots, but I use it as a top dressing rather than as a component of the mix.
There was a scientific article published in the AOS "Orchids"magazine last year about using additives to help keep the potting medium from getting too acidic. I'll have to look up the month... I think the study used dolomite lime, though... not sure whether oyster was also tested.
- Matt |