Some Qs on bamboo.
Hi. Considering bamboo as being the best option for screening. They'd need to be varieties that grow to between 4 and 6m high, and I've shortlisted some species (tho' always open to folks' particular recommendations).
Some general Qs, please. I understand bamboo falls into two basic groups - 'invasive' and clumping? For the former, how controllable are they? I mean, I understand that if they are trimmed close to the ground, that's it - these shoots won't regrow? So, in theory it's simple to keep them in check - at least where the new shoots are accessible and trimmable. My Q would be, tho', how far away from a neighbouring boundary should you be so that roots won't travel beyond the kept-trimmed areas? Will the roots travel more than, say, 2m before popping up again beyond a trimmed area?!
How deep do their roots go before they 'travel'? I'd be planting them on a raised bank, around 0.6 - 1m high; are they likely to go down to below the 'base' ground level and then travel?
Finally, how to encourage spread - is it worth trying to propagate them? Can dug-up clumps be easily split without damage? If so, what's the process? I mean, should they be trimmed before splitting, and then new shoots would grow around them, or is it best to keep them as full-shooted plants and just divide them?
Thanks for any answers, and for any other tips :-)