Trying to flow a spiral surface to a tree trunk (ArtProject)

I am trying to do a spiral surface that runs up a tree trunk. This is for a project I am working on.
So far I have tried to do a helix on a cylinder and with sweap 1 rail I made a spiral surface. Which I am trying to make more tree like by using flow on surface, but it does not work.

I want a pattern to follow the tree trunk and it is supposed to go upwards in a spiral.
TreeSpiralTest.3dm (4.2 MB)

Are there anyone who have some idea on what is wrong or even if I am on the right track.

Super grateful for any suggestions.

All my best
Thomas