Dendrobium

This no id dendrobium came last year from the discount shelf of home renovation store. It didn't have flowers, neither had it roots.
I have used sphag-and-bag method and it grew the new canes, they are potted together and you can still see the pieces of old canes:




Naturally when I saw one of the new canes maturing, I started to wait for a spike.
Well, there is still no spike, but today I have noticed a new growth appearing from the smallest cane.
I wonder why?

Dendrobium noid

I don't know what color the flowers are because I never saw them. Plant came from discount shelf, the blooms were long faded. It grew two new canes since then: