I'd say it's because it's shaded by other bamboo. Try chopping the one behind/in front of, it down, then plant the other one. Replace the chopped one the next day if the other has grown.
Shade = Anything that blocks light. Other trees. Buildings. Etc.
Don’t use obscure fan terms like “shade” and expect people to know what you mean I’ve been playing since 2013 and never heard it before either
Fan terms?
Obscure?
Are you truly having a go at me, over shade?
Grow up.
I've been playing since 2005. :-/
Blocked.