Soft cane dendrobium lifecycle.

[bil]

OK, so the first year it is a soft cane that grows.
The second year the cane is mature, still has leaves and flowers, right?
now what happens the third, fourth and fifth years?

I have a plant with some canes that have no leaves, but did not flower either.

So, at which point do they lose their leaves? Do they then beome storage only, or do those flower under the right conditions?

Thanks.