Is it in a pot or container of some sort, its hard to tell, looks like a zinc watering can, or is that not what I'm looking at? If it is in a container and it is a watering can, how long's it been in there with the other plant?

Main thing, has it got drainage? It can get into a small bush so needs regular trimming or more room.

Yes has got drainage. Was planted about two weeks ago but obviously not happy there! Yes bamboo it is in a zinc flowering can planter, maybe should transfer to a teracotta pot on its own?

It needs to be on its own, also better off in the ground, preferably in a reasonably sheltered spot - these are shrubs really