Coldlime, I wonder if your bamboo is actually Japanese knotweed (fallopia japonica/polygonum cuspidata)? When it gets tall it has large hollow canes. If so, be forewarned it is one of the most invasive species there is. I have been battling it for 20 years in my yard. It can lay dormant for 20 years and come up through sidewalks and roads, or so I've been told. Based on my experience, I believe it. I dug up and sifted the soil along my alley every year for 20 years and my used every vegetation killer known to man, and I still have to pull it out constantly. I had buckthorn in the same area, and that's nothing compared to this monster. And it's a relative of fleeceflower, which I will never ever ever ever plant anywhere, just in case.
Notwithstanding my previous post, that's obviously what I would permanently eradicate!