Here's the pic of the bamboo, not too brilliant so let us know if you can ID this notwithstanding.
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Not a Bamboo but a reed although I couldn't say which - maybe (as you say it looks like the florists' plant, C. papyrus - often used here in the floristry trade and sold as 'curly bamboo' - which it isn't.
To tell if you have a bamboo, run your fingers gently up and down the stem. You will find that you can feel a very obvious knuckle at the point of the leaf nodes, also you'll see that the auricles are slightly to obviously hirsuit, and that the leaf sheaths are discrete to each node, rather than running up the stem - like the ' grasses' per se.
I'll try and put a pic. of some of my bamboos on sometime.
Those are actually cuttings, but having read up I note that it may not be easy to propagate in this manner - or rather it depends greatly on the particular species.
I read that some species may actually root, and survive, with the culm even branching, but never produce a rhizome and thus the plant will just "exist" until it dies of old age.
You need to excavate part of the rootball - as you say, having selected a part of the plant with healthy rhizomes . You can tell the rhizome growth from actual culm growth because the culms grow straight and thick from big fat shoots at the base of the clump, whilst the rhizome growth is weak and spindly.
Take a vine saw with you, long-handled pruners and secateurs, of coarse, as well as excavating tools - a fork and VERY sharp spade are useful.
You'll need to cut away the portion of the rootball and rhizomes that you want to keep - c larger portion obviously - because you're bound to get die-back.
If you decide to do this, you'll need to do some TLC, but bamboo is generally pretty rugged and if you slowly start to nurture this you'll end up with a specimen to be proud of.
I can give you any prop help you might need.
On the other subject that you raised, of the behaviour of the culms - bamboo is generally quite difficult to kill, witness the piece you have there, it WILL die if it 's overstressed eg, caught spray drift, been starved,died of drought.
Thanks for the info, I was not really prepared to go to the trouble as I do have enough subject matter to keep me busy, but if I see any particulaly willing rhizomes I may just yank at them.
Tell me about these large grasses being tough to kill. I'm trying to clear up some Arundo, digging not an option, and they seem to thrive on Roundup!