Leafless old canes are still source of energy for the whole plant and do not need to be removed. Plants will decide when to discard them and let you know by browning&drying them up.
With no leaves, the cane itself is still pretty much alive and even photosynthesize. After all, they are green!
Now, for propagation, it is recommended that you use large, green and wrinkle free (healthy looking in short) canes. Some canes will readily produce keikis, some never will. most are somewhere in between.
I don't recommend sealing up the container canes are in. fungal growth...
Cover with some hole might work better and safer in that regard.
By the way, I've had canes in a empty plastic container with no moisture or mix or whatsoever. placed the container under kitchen sink, dark and dry for almost two month. there were a few keikis.
turns out, that particular dendrobium is just crazy keiki producer anyhow!
Last edited by NYCorchidman; 03-21-2013 at 12:19 AM..
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