cattleya buds, drying sheaths

[mojomick]

Help. I have about 30 cattleya alliance and species. Many are in sheath right now. I do have several whose sheaths seem to be drying out but I can see buds inside. I have read that some catts require you to cut the sheath open. How do you figure out if that is what I should do? I know that some sheaths dry out and produce buds later in the spring. I am at a loss to know what to do. Anybody got any suggestions? I grow in an intermediate greenhouse, low of 55 and max. high of 85. Humidity runs about 50 during day to 88 at night. Thanks for any suggestions. Betty (mojomick)