|Running rhizomes from Phylostachys. Use a rhizome barrier!|
At this point, I'll quickly add that this was not planted by me! Several times each year for the past 3 years I have had to excavate and remove the rhizomes spreading from this clump of bamboo. In this instance, the longest was over 2.5m in length, which is quite a bit shorter than they have been in the past.
Thankfully the plant is surrounded by gravel and so it is not really a problem to remove them once in a while, but if the bamboo had been planted in a border or next to a lawn then this would create quite a headache!