There isn't a lot out there about dendrobium laevifolium and a 'winter's rest'. From what I have read there are some that go completely dormant but others never completely dormant. Mine was growing like crazy, then this month dropped a few leaves but still has a couple hanging in there. Not sure what is next. When I got the plant it was in bloom in Oct. and kept a bloom on for 6 months. Bulbs and roots look great. But I get scared when plants loose leaves, even when they are deciduous.
Thanks for all the advice. I also just bought the same Den. and don't really know how to care for it. The info on the light is timely as I had mine in a south window. (Changing that right away )
There is such conflicting information out there about the light needs. Watch your plant and see how it does. I don't think they need much fertilizer either, but I have been using well water. I keep the roots covered in the spag moss, but I make sure it doesn't get up the sides of the bulbs. Some articles say use rain or distilled water. I know people have been buying this plant lately, they are great little plants.
The main thing is they like to stay moist, that is the only thing the grower told me when I bought it. Some do go dormant, so if you think it died it might just be resting We have this thread to help each other. I just love the cute little flowers and the fine stripes on the pseudobulbs.