From my experience and what I've read, Cattleyas can tolerate lower humidity for a while than some other orchids. I think that's especially true during the winter months. I let my catts get very dry between waterings and I soak them really well when I do water. As for the size of the roots, it's hard to say. The roots will get bigger as the plant gets bigger. Some varieties may naturally have thicker roots than others. Also nutrition may play a role. I started using liquid seaweed as a supplement and the roots on my orchids grew noticably thicker. Good luck.
Last edited by tucker85; 12-26-2010 at 10:01 AM..
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