I grow a lot of Cattleyas. But I grow outdoors in south Florida so you may want advice from someone who grows in an environment more like yours. I use unglazed clay orchid pots. The Home Depot near me carries a 5" clay orchid pot that I really like for many of my catts. Clay pots are heavy so they don't tip over as easily and the the medium dries fast. I use Hydroton as my medium. I use it alone or I sometimes mix it with charcoal and tree fern fiber. I let my Cattleyas get very dry between waterings but they are in a humid environment here in south Florida so that helps. When I do water, I water several times a few minutes apart to make sure I get everything good and wet. During the growing season I give a lot more water with an occasional dry spell.
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