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I am still struggling to get to grips with winter rest as well. I used to grow orchids that didn't need it, now I have some that do and I'm still experimenting with what works and have always been confused by whether you are meant to water at all, or mist during the winter rest.
One think I learned only late last winter is that while people talk about resting being Halloween to Valentines, reducing/stopping fertiliser from the end of August can also be important. This is the first winter I've done that and I'm seeing results in some flower buds on dendrobiums I've not managed to bloom before.
I'm very occasionally giving rain water to my couple of nobile dens this year. I don't really know my humidity, but I'm basing it on when the medium starts looking really dry. It's not necessarily a case of keeping them bone dry, but the medium dries out far far far slower in winter and so if you water as much as in the summer you will rot them, watering when they tell you to (when the medium dries) and letting the medium go somewhat drier than in the summer seems to be working for me so far this year.
Some folks say that you don't actually need to stop watering, but it's the lack of fertiliser which is the most important. I don't have enough experience to know for sure, however I have lots of keikis of a hybrid of den unicum and for those I'm watering every 2-3 days with rain water and they have not had fertiliser since the end of August. They have stopped growing and the most mature of them are now producing flower buds (the first time for me managing to rebloom this hybrid)
However on the other hand, my Den kingianum keikis in the house have had the same treatment and they have just decided to set off growing again (no sign of flowers) while the keikis which were still on the parent and getting very very occasional water (more like once every 3-4 weeks) are all spiking (the ones spiking have also been kept cooler in the greenhouse so not sure exactly what has made the difference).
I think this is one of the problems, not all species/hybrid that need a winter rest need that rest to take exactly the same form. The advice I remember is to keep an eye on them and if you stop watering, then give a little water still if the canes are wrinkling too much... but how much is too much, very difficult for a newbie to winter resting to know
I share you pain in not finding it very clear on how to rest orchids. I tend to err on the side of watering too much and I haven't killed them by doing that so far... I just haven't had flowers from many of the deciduous ones. Careful experimentation with no fertiliser and less water has this year given results, but it's taken several years to find a balance that works for me and I'm still unsure with some of them.