I think that maybe Julie, you are right. Thanks Julie! I used to have this problem everytime I moved plants from growing outside to wintering inside the house. I don't do this anymore. I always thought that is due to the temperature shock.
For cattleyas, however it could a combination of 2 factors: cold and wet at the same time. Cold and wet will cause root rot. And when the catts lost their roots en mass, they drop their leaves, the older ones first then the new ones. The remedy: allowing the plants to dry out and keep them warmer at night (60 F or above), they will re-root and you will be fine!
Cheers. Hoa.






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