Partially dead sapling

[Vigen Tigen]

Please could somebody help advise with the following dying sapling. This was planted a couple of months ago, and there is life in the cambium up to the point indicated and above it is dead! Just wondering if I should leave or trim the dead part off or is there something else I need to be aware of? The sapling came from a bunch of shoots that I cut away from a root and it grew a reasonable root ball when stuck in water for a year prior to planting (others from the same group have successfully taken)

[Mick Dempsey]

What type of tree is it?

[Vigen Tigen]

I believe it's Alder

[Dan Maynard]

1 hour ago, Vigen Tigen said:

Just wondering if I should leave or trim the dead part off

The tree doesn't mind at all whether you cut the dead part off or not, it's stopped interacting with it. I'd probably cut it off so you can see new growth more easily.