Arundo Donax is definitely hardy in zone 6. I’ve got clump in its 5th year. Pretty thing the variegated one. My neighbor’s thing I’ve got 12 foot tall striped corn growing.
This is pictures of what I have growing. I don’t know if it’s real bamboo or not.
I think they called Pseudosasa japonica “Japanese Arrow” .
They look like Japanese Arrow bamboo to me.
I looked it up and I agree. Must be another bird transplant. It wasn’t there until this year.
Bamboo rarely seeds, and seedlings do not take off that fast, its just something you hadn’t noticed yet.
Good info. I didn’t know that. And your right. It could very well be the case I never noticed them before.