Posted: 01/11/2015 at 19:36
I'd politely tell him about it first to see if he could solve it from his side. If you have no success then you have two options. First you can dig next to the boundary and put a physical barrier between the bamboo and your garden. Sheet perspex is one of the best barriers angled into his side. Or spray any emerging shoots with glyphosate based weed killer. The latter may kill the whole plant, although that's unlikely with bamboos. The wrong bamboos on boundaries just like leyllandii can be a source of great contention between neighbour's.