want to try growing Cattleyas :D

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Hey!

I have many different types of orchids, but no Cattleyas. I once purchased a cattleya at an orchid show, but unfortunatly, it died. The roots were dead when I looked at them about two weeks after I purchased it. From what I have heard, the roots must have been rotten before I purchased the plant; so I would like to try growing one again!

I would like to know about how long it should take them dry out before watering again, and what type of medium is best for their roots.

thanks so much