@tonyOmahaz5 , I don’t want to sound like I’m trying to discourage you. Many factors can play a role in how quickly that tub gets filled up with rhizomes and root bound.
I don’t want to add to any hysteria, but if there is a way out then it is possible for a rhizome to squeeze through. I think a lot of the bamboo hysteria is due to the fact that the shooting season is so dramatic. Where just a few weeks prior there was a flat well-manicured lawn, now there are 10’s or even 100’s of giant shoots rocketing out of the ground at an alarming growth rate. One thing that must be kept in mind is bamboo spends an enormous amount of energy in producing these shoots. These shoots meanwhile are not photosynthesizing or at least not in any large amount. If you knock the shoots down prior to them leafing out, then you just starved that rhizome of all it’s hard work. New shoots are quite tender, if I don’t like where one is I simply kick it over.
Also, shooting season is a short time frame. My phyllostachys shoot over a few week period. Sure you may get a summer whip shoot or two, but those are few and far between. For me, I would much rather keep a grove of bamboo maintained/contained than deal with this pervasive bahiagrass we have down here. A simple kick or sickle slice vs. a grass that continually chokes both my trees and lawnmower. @Barkslip if after X amount of years you do get an escaped rhizome and it’s on your property, I wouldn’t worry terribly about it. I routinely have bamboo rhizomes escape through drainage holes in 30 gallon pots. They may send up a much smaller “survival” shoot or two after removal of the first. This is evidence the rhizome is dying, which is great for my compacted clay soil.
Dax, I can see your concern for the property line. I wish I could say you are 100% guaranteed never to have a rhizome run into those woods, but unfortunately I can’t. I think odds are very low for the next decade or so. If you ever did have an issue with this border you could till (as long as no piping or wiring is present). I visited the Coastal Georgia Botanical Gardens a few years back, which is a historic bamboo garden. They simply till between the small plots of bamboo. I don’t know if they till once or twice a year, but I imagine once during the fall would be sufficient. These plots are many decades old, but each year there are a decent amount of shoots in the allocated plots.
@Barkslip Fargesia dracocephala ‘rufa’ is an actual bamboo, it’t not the same as the species you mentioned above. One source says it’s hardy to -5 F, and grows 6 foot with 0.5 inch canes. Another source (Bamboo Garden) says it’s hardy to zones 5 through 9 and grows to 10 foot with 0.5 inch canes. Once again, it’s a clumper this means it’s does not send out horizontal rhizomes. No barrier is needed. I don’t know how well it will do for you guys in your zone, but it can’t hurt to try one. Sure, you would never get the amount of poles as compared to say P. Bissetii, but not many bamboo species do in temperate zones.
I hope this was some help.