I would pot them in separate pots. Your Cattleyas, depending on what ancestry they have, may have different requirements concerning watering.
As for medium, it really depends on the conditions you are able to offer. For my conditions (cooler home during the winter, outside during the summer), I prefer red lava rock. It is really difficult to kill them in that.
With Cattleyas, I have found that a little extra calcium will help ward off fungus and bacterial problems.
Good luck!
__________________
I decorate in green!
|