I use bark with plastic pots. I cut four wide'ish slits down the sides of the pots and I put wine corks on the bottom of my pots instead of styrofoam peanuts for added ventilation and a few inches of bark on top of that. My pots are REALLY tightly packed, I grow my orchids outside here in Hawaii (which is less hot and humid than southern FLA) and have only had one incident with Catt root rot, and that was because I had inadvertently bought a skinneri that was already infected. This style of potting requires more water during the summer (at least once a day for me), but also allows for weeks of rain to roll through with no ill effects for my 'chids.
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Sandy4453 
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