As a general rule you can consider:
1) Night temperature around and over 10ºC are no problem for most Cattleya hybrids.
2) By night temperatures in between 3 to 10ºC it is recommended to keep the roots dry. Protect the plant from rain with plastic cover. Water the plants only when the next 2 days the temperature will be over 10ºC.
3) Below 3ºC is not recommended. Or you have to heat the green house or you have to take the plants in to a warmer environment.






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